Document:

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                                                                    Exhibit 10.4

                               *** TEXT OMITTED AND FILED SEPARATELY
                                   CONFIDENTIAL TREATMENT REQUESTED
                                   UNDER 17 C.F.R. SECTIONS 200.80(b)(3),
                                   200.80(b)(4) and 230.406

               ORBCOMM CONCEPT DEMONSTRATION COMMUNICATION PAYLOAD
                         PROCUREMENT AGREEMENT B10LG1192

This ORBCOMM Procurement Agreement (this "Agreement") is made and entered into
as of the 3rd day of November, 2004 (the Effective Date") between ORBCOMM Inc, a
Delaware corporation ("ORBCOMM") with its principal place of business located at
21700 Atlantic Boulevard, Dulles, VA 20166 and Orbital Sciences Corporation, a
Delaware corporation ("Orbital") with its principal place of business located at
21839 Atlantic Boulevard, Dulles, Virginia 20166.

WITNESSETH

WHEREAS ORBCOMM has received United States Government Contract
#HSCG-23-04-C-ADA-001 (the "United States Government Contract" or the
"Contract") from the United States Coast Guard to develop the capability to
receive, process, and forward the Automatic Identification System (AIS) Signal
via spacecraft and associated ground systems; and

WHEREAS ORBCOMM has received an order under the Contract to deliver a Concept
Demonstration Communications Payload and to launch and demonstrate functionality
of the same; and

WHEREAS ORBCOMM desires to contract with Orbital for the overall design,
manufacture, test, and delivery to ORBCOMM the Concept Demonstration
Communication Payload for the ORBCOMM Automatic Identification System (AIS) and
provide payload integration support and on-orbit operations support as specified
in the Contract Statement of Work. Additionally, as an option defined herein,
there is a potential for Orbital to provide thereafter up to five (5) additional
identical or similar such payloads for the AIS, if approved, and an option for
six (6) ORBCOMM satellites with integrated AIS payloads and an option for six
(6) ORBCOMM satellites with integrated payloads similar to the current ORBCOM
payload utilized on the Plane B spacecraft.

NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein, and other valuable consideration, the receipt and sufficiency
of which is hereby acknowledged, the parties hereto agree as follows:

ARTICLE 1 - DEFINITIONS

"ORBCOMM AIS Demonstration Payload Statement of Work" B15051188 - Rev New dated
November 2nd, 2004 And "ORBCOMM Concept Demonstration Spacecraft Communications
Payload Specification" B15051189-Rev D dated October 6th, 2004 shall mean the
payload statement of work and specifications attached hereto as Exhibit A,

"Options" shall mean the Additional AIS Payloads as set forth in Section 2.1 and
ORBCOMM Spacecraft with AIS Payloads and ORBCOMM Spacecraft with ORBCOMM Plane B
similar payloads to be defined at the time of the option execution.

"Payload" shall mean the communication payload equipment including an Automatic
Identification System (AIS) receiver as described in the Concept Demonstration
Spacecraft Communications Payload Specifications and the ORBCOMM, AIS
Demonstration Payload Statement of Work (SOW) dated November 2nd, 2004 as set
forth at Exhibit A, Part 1

ARTICLE 2 - SCOPE OF WORK

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Consistent with the terms and conditions set forth herein. Orbital shall furnish
the management, labor, facilities and materials required for the performance by
it of the following work (collectively, the "Work"):

Section 2.1 - Manufacture of Payload. (a) Orbital shall design, manufacture,
test and deliver to ORBCOMM the demonstration payload (the "Demo Payload") in
accordance with the Payload Statement of Work and the Payload Specifications as
set forth at Exhibit A.

(b) ORBCOMM shall have the option (the "Option") to require Orbital to construct
and deliver to ORBCOMM up to five additional payloads (the "Optional Payloads")

                                       Or

ORBCOMM shall have the option (the "Option") to require Orbital to construct and
deliver to ORBCOMM six (6) ORBCOMM Spacecraft with AIS integrated payloads (the
"Optional AIS Spacecraft")

                                       Or

ORBCOMM shall have the option (the "Option") to require Orbital to construct and
deliver to ORBCOMM six (6) ORBCOMM Spacecraft without AIS integrated payloads
(the "Optional ORBCOMM Spacecraft")

(c) The Option shall be exercisable, at the times and prices defined in Exhibit
F.

Section 2.2 - Other Documentation. Orbital shall prepare, develop and submit to
ORBCOMM the documentation set forth in the CDRLs of the AIS Demonstration
Payload Statement of Work.

Section 2.3 - Payload Storage. Orbital shall provide ORBCOMM, on a time and
materials basis, at the rate specified in Exhibit B, technical services
associated with the storage of Payloads when required by ORBCOMM, relating to
the ORBCOMM AIS System.

Section 2.4 - Regulatory and Export Matters. Orbital shall provide to ORBCOMM
where practical, the technical data needed by ORBCOMM (a) to obtain and maintain
the required United States regulatory authority needed to manufacture and export
the Payload and any Option Payloads and (b) to take reasonable actions in any
regulatory proceedings to defend any claims against any regulatory authority
granted to ORBCOMM or any of its subsidiaries in connection with the Payloads.

ARTICLE 3 - WORK SCHEDULE AND DELIVERY

Section 3.1 - Completion of the milestones is set forth in Exhibit B - Work
Schedule and Delivery (the "Milestones"). Completion of Milestones shall be
determined as described in Section 5.3.

(b) Demo Payload. The first Demo Payload shall be ready for delivery twelve (12)
months following the receipt of the first milestone payment.

(c) Options. Options shall be ready for delivery in accordance with the delivery
schedule defined in Exhibit B

ARTICLE 4 - CONSIDERATION

Section 4.1 - Price. The price for the Demo Payload (the "Price") is as follows:

(a) Demo Payload

  One (1) each        $3,305,000

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         TOTAL $3,305,000
               ==========

The Price for the Demo Payload represents a fixed price.

Section 4.2 - Price of Options. The prices for the Options (the "Option Prices")
are defined in Exhibit F:

The price and terms of any such Option Payloads shall be no less favorable to
ORBCOMM than those made available by Orbital to NASA for similar products,
without any obligation on ORBCOMM to pay NASA prices.

Section 4.3 - Technical Assistance. For technical assistance tasks, other than
those set forth in Section 2.1, the following shall apply:

(a) Orbital shall provide to ORBCOMM on a time and materials basis as defined in
Exhibit E technical services, the cost for which is estimated to be less than
One Hundred Thousands Dollars ($100,000), as and when required and directed by a
Task Order issued by ORBCOMM, relating to the Payloads. Orbital shall be
required to submit to ORBCOMM a monthly report in writing for active Task Orders
that outlines the total hours expended during the month and the total dollar
amount spent, including cumulative amount.

Section 4.4 - Taxes (a) The Price (to include any Option Prices) does not
include any federal, state or local sales, use or excise taxes levied upon or
measured by the sale, the sales price, or the use of the items to be delivered
or services required to be performed hereunder.

(b) In cases where Orbital and/or ORBCOMM are wholly or partially exempt from
such taxes and duties or otherwise entitled to relief by way of protest, refund
claims litigation or other proceeding, Orbital shall take all necessary steps to
facilitate such exemption or relief by:

(i) Using reasonable efforts to bring about the exemption or relief before
submitting the invoices to ORBCOMM; and

(ii) Complying with all formalities necessary to enable ORBCOMM to claim
reimbursement with respect to taxes and duties that have been paid. For this
purpose, Orbital shall comply with the reasonable instructions given to it by
ORBCOMM and provide in due time the information that ORBCOMM reasonably
requires.

If any such tax is determined to be legally due from either Orbital or ORBCOMM,
ORBCOMM shall pay it separately. ORBCOMM shall pay, or reimburse Orbital for all
out-of-pocket expenses incurred in connection with the activities contemplated
by this Subsection 4.4(b).

Section 4.5 - Insurance. (a) The Price(s) includes the cost of property
insurance and general and product liability insurance for the Payloads until
ORBCOMM takes delivery of the payload.

(b) The Price does not include the cost to insure the payloads during any period
of time in which the Payloads are put into storage. Orbital shall obtain the
appropriate levels(s) of insurance required to cover the repair or replacement
costs, as the case may be of the Payloads during storage. ORBCOMM shall pay or
promptly reimburse Orbital for all expenses incurred by Orbital on behalf of
ORBCOMM in obtaining the Payload storage insurance, upon receipt of Orbital's
invoice therefor.

ARTICLE 5 - PAYMENT TERMS AND INVOICING

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Section 5.1 - Invoicing.

For all Milestone Payments, Orbital shall submit an invoice for each Milestone
Payment in accordance with the payment schedule defined in Exhibit E. Each
invoice shall identify the Milestone for which payment is being requested and
the amount requested. Payments shall be due net 30 days.

For all invoices for time and material tasks, Orbital shall provide a
certificate, signed by the Vice President and Controller of Orbital or by any
other officer designated by the Vice President and Controller of Orbital,
certifying the accuracy of the costs incurred that are the subject of the
respective invoice. The invoices shall include, but not be limited to, a listing
of labor costs, including labor hours by bid rate group, material subcontracts
and ODC's as to enable ORBCOMM to fully comprehend the total monthly charges
being invoiced by Orbital. Invoices shall be submitted to the following address:

  ORBCOMM, Inc
  Attn: Controller
  21700 Atlantic Blvd.
  Dulles, VA   20166

Section 5.2 - Milestone Achievement. (a) A Milestone shall be deemed achieved
upon the successful demonstration by Orbital that the Work that is the subject
of the Milestone has been completed in accordance with the requirements of this
Agreement, and that all conditions established by this Agreement as
prerequisites to payment of the invoice have been fulfilled to ORBCOMM's
reasonable satisfaction.

(b) In the event that Orbital fails to achieve any Milestone on or before the
scheduled completion date shown in Exhibit B, ORBCOMM shall be relieved of its
obligation to pay the applicable amounts specified for such Milestone until such
time as Orbital achieves such Milestone or obtains a waiver in writing from
ORBCOMM for such achievement. Orbital's failure to timely complete any Milestone
shall not relieve ORBCOMM from its obligation to pay for other achieved
Milestones.

(c) If ORBCOMM concludes that the Milestone event for which any invoices have
been submitted has not been successfully completed in accordance with the
requirements of this Agreement or that any condition established by this
Agreement as prerequisite to payment has not been fulfilled, it shall provide
Orbital written exceptions within ten (10) business days after receipt of the
invoice, specifying in detail the non-conformance. The applicable payments shall
be made within five (5) business days after ORBCOMM's receipt of Orbital's
response, in writing, addressing in detail each of ORBCOMM's exceptions;
provided however, if with respect to any such Milestone, ORBCOMM reasonably
concludes that Orbital's response to ORBCOMM's exceptions to be non-responsive
and so notifies Orbital as provided in Subsection 5.5 (c) (i) below, ORBCOMM
may, at its sole discretion, defer any unpaid amount of the relevant Milestone
payment until the resolution of the matter as described in Subsection 5.3(c)(i)
below.

(i) In the event ORBCOMM concludes that Orbital has been non-responsive to
ORBCOMM `s exception to a Milestone, ORBCOMM shall notify Orbital thereof in
writing (the "Exception Notification") within ten (10) business after receipt of
Orbital's response to ORBCOMM written exception. The Exception Notification
shall (A) specify in detail the reason(s) ORBCOMM believes Orbital's response to
be non-responsive, and (B) advise Orbital formally that ORBCOMM intends to
withhold payment for such Milestone(s). On receipt of an Exemption Notification
from ORBCOMM, Orbital shall have thirty (30) days to demonstrate the achievement
of the relevant

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Milestone to the reasonable satisfaction of ORBCOMM. If Orbital is unable to
make such a demonstration, ORBCOMM may defer payment as provided above. If
Orbital continues to dispute the OBRCOMM assertions of non-compliance, either
party may, at any time after the filing of the Orbital additional response as
permitted by this Section 5.3 (c)(i), submit the matter to be resolved by
arbitration as provided in Section 12.3 hereof.

Section 5.3 - Certification and Auditor Review of Submitted Invoices. In order
to assure ORBCOMM that the invoices that are submitted accurately reflect (i)
the actual hours expended, and actual cost incurred for travel expenses,
material and other direct cost (ODC) for T&M payments, and (ii) the correct
Milestone completion effort to be invoiced under the terms of this Agreement,
Orbital will provide with each invoice a certification executed by the Vice
President of Orbital's Space Systems Group that the sums invoiced are current,
complete and accurate and that they are allowable and allocable to the invoice
being presented and to this contract. If the United States Government should
require that invoices be certified in addition to the above referenced
certification, Orbital shall provide such other Government required
certifications as are required. ORBCOMM may request the Government to review the
accuracy of submitted invoices under this agreement against Orbital's accounting
books and records. In the event that an error was made and ORBCOMM was
overcharged, the amount of the overcharge shall be determined by the auditors
and the overcharged amount, shall be refunded to ORBCOMM within thirty (30)
business days from the date of notification by the auditors. To the extent that
Orbital does not agree with the auditors' determination, such dispute shall be
settled in accordance with Section 12.3.

ARTICLE 6 - ACCESS AND ACCEPTANCE

Section 6.1 - Access. Subject to the receipt of any and all required
governmental approvals, ORBCOMM authorized representatives shall have the right,
on a not-to-interfere basis, at all reasonable times during the performance of
this Agreement, to monitor the Work in progress (including without limitation
all test activities with access to related computer program information to the
extent reasonable safeguards can be implemented) at the plant(s) of Orbital.
Orbital shall use all commercially reasonable efforts to incorporate in all of
its subcontracts Orbital's and ORBCOMM's rights to monitor work in progress as
provided herein, provided that any additional direct expenses associated with
the exercise or implementation of such rights shall be borne by ORBCOMM.

Section 6.2 - Inspection and Acceptance. ORBCOMM authorized representatives
shall promptly conduct a final inspection of the Demo Payload and any Option
Payloads ordered in accordance with the Verification and Test Plan or, at
ORBCOMM's option, witness such inspection by Orbital and shall either approve
them for acceptance in writing or promptly notify Orbital in writing of the
particulars in which they are non-conforming with the applicable Specifications.
If no objections have been sent by ORBCOMM within (15) days of the inspection,
the relevant payload shall be deemed to have received approval for acceptance by
ORBCOMM. Corrections required to render the payloads in conformance with the
applicable Specification shall be made by Orbital at its cost. The decision how
to make the corrections shall be at Orbital's sole discretion and an item found
to be non-conforming during or after testing performed under this Agreement
shall at ORBCOMM's request and without charge to ORBCOMM be retested by Orbital
after Orbital has remedied the non-conformance. ORBCOMM may be assisted in all
inspections by its consultants or advisors. This final inspection and acceptance
shall take place at Orbital's Dulles facility prior to delivery to ORBCOMM.

Section 6.3. - Corrections in Delivered Payloads. (a) If at any time, either
Orbital or ORBCOMM becomes aware that any payloads delivered under this contract
are defective as a result of the operation of on-orbit Satellites which
defect(s) has resulted from a defect in workmanship or materials or adherence to
the statement of work or specification then the following shall occur: (i)

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if the discovery is made by Orbital, Orbital shall notify promptly ORBCOMM of
such defects and to the extent that ORBCOMM determines that such defects would,
in the reasonable opinion of ORBCOMM materially adversely affect the operation
of the ORBCOMM AIS System. Orbital shall take prompt and appropriate corrective
measures to eliminate any such defects from all unused payloads, or (ii) if the
discovery is made by ORBCOMM, ORBCOMM shall notify promptly Orbital of such
defects that would, in the reasonable opinion of ORBCOMM, materially and
adversely affect the operation of the ORBCOMM AIS System. Orbital shall be
obligated within ten days to verify and respond to the ORBCOMM notification of
defective delivered and not yet launched payloads, and, in the event the defect
has been verified, Orbital shall take prompt and appropriate corrective measures
to eliminate any such defects from all such payloads. The decision how to make
the corrections shall be mutually agreed upon by ORBCOMM and Orbital.

(b) If the defects so identified are not the result of any failure to adhere to
the applicable specifications and SOW on the part of Orbital, ORBCOMM shall pay
the costs of such corrections identified in Section 6.3(a) and Orbital shall
charge for the effort expended on such corrections; provided however, that if
the material defect is found as a result of on-ground testing of the payloads by
Orbital or Orbital's subcontractors, then the corrections shall be deemed to be
in the Scope of Work. Orbital's obligation to correct such material defects in
the payloads shall end the sooner of Twelve (12) months after acceptance of the
hardware by ORBCOMM or launch. After such date corrections to such payloads
shall be made at a price mutually agreed to by ORBCOMM and Orbital. ORBCOMM
shall decide whether to proceed with the corrections of such material defects.
If the defects so identified result from the failure of Orbital to adhere to the
applicable specifications and/or SOW, then Orbital shall be responsible to
correct the defect in workmanship and/or material at no increase in Contract
price.

ARTICLE 7 - TITLE AND RISK OF LOSS

Title to, beneficial ownership of, and right to possession to and risk of loss
of or damage to the payloads shall pass to ORBCOMM upon final acceptance at
Orbital's Dulles facility.

ARTICLE 8 - CHANGES

Section 8.1 - Changes. At any time and by written order, ORBCOMM may make
changes within the general scope of this Agreement in (a) the Specifications or
the Statements of Work, (b) the method of packing or shipment, (c) place or time
of delivery, or (d) the quantity or type of the items to be delivered or
services required to be performed hereunder.

Section 8.2 - Adjustments to Agreement. (a) If any change causes an increase or
decrease in the Price, or in the time required for performance of any part of
the Work, whether or not directly changed by the order, ORBCOMM and Orbital
shall negotiate an equitable adjustment to such Price, delivery schedule or
other provision of this Agreement. Orbital shall perform the Work as changed
pending resolution of any negotiation under this Article 8.

(b) Orbital must assert in written proposal that addresses its right to an
adjustment under this Article 8 within thirty (30) days from receipt of the
written order.

(c) If Orbital's proposal includes the cost of replacing property made obsolete
or excess by the change, ORBCOMM shall have the right to prescribe the manner of
the disposition of the obsolete or excess property.

(d) Failure to agree to any adjustment shall be a dispute and shall be settled
in accordance with Section 12.3 provided that nothing in this Section 8.2 shall
excuse Orbital from proceeding with the Work as changed.

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(e) The exercise of any Option contemplated by this Agreement shall not be
considered a change to this Agreement.

ARTICLE 9 - REPRESENTATIONS AND WARRANTIES

Section 9.1 - Representations and Warranties. Orbital represents and warrants
that (a) it has and it shall deliver to ORBCOMM at the time of title passing
pursuant to Article 7, sole and good legal and equitable title to the items to
be delivered or to the extent applicable, the services required to be performed
pursuant to Article 2, free and clear of any and all security interests, liens,
claims, charges and encumbrances of any kind or nature whatsoever, together with
full power and lawful authority to sell, deliver and perform the items to be
delivered or to the extent applicable, the services required to be performed
under Article 2, (b) the items to be delivered or to the extent applicable, the
services required to be performed shall be free from defects in material and
workmanship and shall operate and conform to the statement of work and
specifications as set forth in the in the contract, (c) neither the delivery of
the items nor the performance of the services required to be performed by
Orbital shall in any way constitute an infringement or other violation of any
copyright, trademark or patent or other validly registered enforceable
intellectual property right of any third party, and (d) the items to be
delivered and the services required to be performed hereunder shall be in
compliance with all applicable United States laws, rules and regulations.

Section 9.2 Remedies for Breach of Warranty and Warranty Period. ORBCOMM's sole
remedy for payload failure, defects, failure to conform with applicable
Specifications or any other requirements shall be limited to (i) non-payment to
Orbital of the Price for the Payload (s) so affected and (ii) termination
remedies under Article 10.

Section 9.3 - Limitation of Liability. (a) ORBITAL SHALL NOT BE LIABLE FOR
INDIRECT, INCIDENTAL, CONSEQUENTIAL OR OTHER DAMAGES RESULTING FROM THE USE OF
ANY OF THE GOODS OR SERVICES TO BE PROVIDED HEREUNDER, OTHER THAN THE
LIABILITIES EXPRESSLY STATED HEREIN. THE WARRANTY SET FORTH HEREIN IS IN LIEU OF
ALL OTHER WARRANTIES EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Section 9.4 - Patent Indemnification. (a) In the event of a breach of the
representation and warranty set forth in Section 9.1(c), Orbital agrees to
indemnify and hold harmless ORBCOMM and its permitted successors and assigns of
its products from and against all loss, damages, claims, demands and suits at
law or in equity, for actual or alleged claims, demands and suits at law or in
equity, arising out of such breach or alleged breach.

ARTICLE 10 - TERMINATION

Section 10.1 Termination. (a) This order may be terminated at any time by the
mutual agreement of the parties, which agreement shall specify their respective
remaining rights and duties.

(b) ORBCOMM may, by written notice of termination to Orbital terminate this
Agreement upon the failure of Orbital (a) to achieve any of the Milestones
within four (4) weeks after the scheduled completion date set forth in Exhibit
B, provided that scheduled completion dates shall be extended by any excusable
delays as a result of a force majeure event under Section 12.2; (b) to comply in
any material respect with any of the provisions of this Agreement and to correct
such failure, within sixty (60) days from the date of Orbital's receipt of
written notice thereof from ORBCOMM authorized representative setting forth in
detail ORBCOMM basis for termination of the Agreement; or (c) termination of

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ORBCOMM's prime contract by ORBCOMM's customer, the United States Government.

(c) Orbital shall be in default under this agreement if it fails to deliver the
goods covered hereunder, or does so beyond a reasonable time, or delivers goods
of a quality differing from or inferior to the referenced applicable
specifications. A stoppage of work, initiated by Orbital as a direct result of
ORBCOMM's failure to make timely payment against any properly and appropriately
submitted invoice shall not be grounds for Default.

(d) Orbital shall be in default under this agreement in the event that Orbital
fails to comply with any applicable federal, state or local laws pertaining to
the subject matter of this agreement or the work required to fulfill the
requirements of this agreement.

(e) This order may be unilaterally terminated by ORBCOMM for default by Orbital
without prejudice to any claim for damages or other relief arising out of such
default.

(f) This order or, at the option of the ORBCOMM, individual orders placed
hereunder may be terminated in whole or in part by ORBCOMM for its convenience
or because of termination of a relevant United States Government prime contract.

Section 10.2 - Remedies Upon Termination.

(a) In the event of termination of this Agreement by ORBCOMM as provided for
hereinabove, Orbital shall:

(i) At ORBCOMM's request, to the extent it is permitted to do so by law,
regulation and any third party obligations pertaining thereto, deliver to
ORBCOMM all completed items to be delivered under Article 2, work-in-process,
drawings, and other technical data associated with the Work developed as part of
the performance of the completed Milestones of this Agreement along with
appropriate licenses to the intellectual property embodied in all such items,
drawings and other technical data sufficient to enable ORBCOMM to use, make and
have made such items, as would have been required as a deliverable had the work
continued to completion, provided that such data and licenses shall be used
exclusively for purposes related to the ORBCOMM System and shall be subject to
appropriate confidentiality obligations.

(ii) At ORBCOMM's request and to the fullest extent permitted by law, and
subject to applicable laws, regulations and terms of this Agreement, transfer
the applicable approvals, permits, and licenses pertaining to the goods
delivered under this Agreement.

(iii) Take all commercially reasonable steps to protect and preserve the
property referred to in (i) above in the possession of Orbital until delivery to
ORBCOMM.

(iv) In the event this agreement is terminated as a result of a termination for
convenience of the United States Government prime contract in support of which
this agreement has been entered, provide to ORBCOMM as soon as possible but in
any event not later than ninety (90) days after receipt of notice of such
termination for convenience, a certified statement of all damages for which it
will require ORBCOMM to seek reimbursement. In such event, Orbital shall retain
all Milestone payments received to date and be reimbursed for all costs
(including a reasonable fee thereon) that are in excess of Milestone payments
received and for which ORBCOMM is able to obtain payment from the United States
Government. Orbital shall cooperate fully with the United States Government and
ORBCOMM regarding the presentation of a termination for convenience request for
payment, including but not limited to providing all required certifications and
permitting all required United States Government audits in conjunction
therewith. ORBCOMM shall present the Orbital termination for convenience costs
to the Government and shall use its best efforts to permit Orbital to be able to
participate directly with the Government in the negotiation of those termination
for convenience costs which pertain to Orbital.

(v) In the event this Agreement is terminated solely for the convenience of
ORBCOMM (and not due to the termination of the relevant United States prime
contract), Orbital shall be entitled to

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retain all Milestone payments received to date and shall further be entitled to
be reimbursed for all costs (including a reasonable fee) in excess of such
Milestone payments that have been incurred by Orbital in support of this
Agreement. Orbital shall have the obligation to mitigate all such costs to the
extent such mitigation is possible.

(vi) In the event that this Agreement is terminated for default, Orbital shall
be permitted to retain the Milestone payments previously received prior to the
termination subject to the following conditions. ORBCOMM shall be obliged to
mitigate the damages sustained as a result of such default by Orbital to the
extent permitted by the Contract. If ORBCOMM elects to complete the undelivered
items specified in the Agreement, Orbital will be responsible for the
reprocurement cost of the remaining undelivered items up to the value of those
undelivered items as specified in this Agreement, and, if requested by ORBCOMM,
Orbital will, for the sole purpose of enabling ORBCOMM to complete the
undelivered items specified in the Agreement, make available to ORBCOMM
Foreground and Background Information necessary to enable ORBCOMM or its
designee to complete the items. Orbital will permit use of the aforementioned
Foreground and Background Information by ORBCOMM's designee only after Orbital
has been notified of ORBCOMM's intentions to make such Information available to
a third party and Orbital and ORBCOMM's designee have executed a non-disclosure
agreement, which will be in substantially the same form as that non-disclosure
agreement which exists between Orbital and ORBCOMM at the time of execution of
this Agreement, to protect such Information If ORBCOMM elects not to complete
the undelivered items specified in the Agreement, ORBCOMM and Orbital shall
agree on the disposition and amount of payment for undelivered manufacturing
materials decided by the parties to be delivered to ORBCOMM. Failure to agree
will be a dispute under Section 12.3. If, after termination, it is determined
that Orbital was not in default, or that the default was excusable, the rights
and obligations of the parties shall be the same as if the termination had been
issued for the convenience of the Government.

(b) Any disagreement under this provision, including disagreements with respect
to ORBCOMM's right to seek a termination and the appropriate remedies for
termination, shall be resolved in accordance with Article 12.3 of this
Agreement.

ARTICLE 11 - OWNERSHIP OF INTELLECTUAL PROPERTY

Section 11.1 (a) Except as set forth in Sections 11.1(b) and 11.1(c) and except
as required by the terms of the Prime Contract, all foreground IP related to the
Work is the exclusive property of ORBCOMM. All rights, title and interest in and
to all background IP relating to the Work shall remain exclusively in Orbital
and/or its subcontractors, notwithstanding Orbital's disclosure of any
information or delivery of any data items to ORBCOMM or ORBCOMM's payment to
Orbital for engineering or non-recurring charges. ORBCOMM shall not use or
disclose such information or property to any third party other than as required
by the terms of the Prime Contract without the prior written consent of Orbital.
Title to all tools, test equipment and facilities not furnished by ORBCOMM or
specifically paid for by ORBCOMM and delivered to ORBCOMM under this Agreement
shall remain in Orbital and/or its subcontractors. Foreground information is
defined as that data, regardless of format, that is first conceived, developed
or produced by Orbital in the performance of this Agreement. Background
information is defined as data, regardless of format, and inclusive of all
technical information trade secrets, and proprietary information that was
conceived, developed or produced by Orbital prior to performing under this
Agreement or outside of the efforts required by this Agreement.

Section 11.2 To the extent that computer software, source codes, programming
information and other related documentation relating to the Work, (the
"Background Information") are not deliverable data under this Agreement (or to
the extent that they are deliverable data, that no ownership or license rights
are being transferred to ORBCOMM), Orbital, to the extent that it has

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the right to do so, shall provide to ORBCOMM on an as needed basis, the right to
access and copy such Background Information to support its analysis of the
ORBCOMM System, to develop alternative solutions for technical problems
affecting the operation and management of the ORBCOMM AIS System and to design
modifications to the Background Information but in any event, not for any
re-procurement. To the extent that ORBCOMM designs modifications to the
Background Information it shall not have the right to implement such
modifications without the prior written consent of Orbital, which consent shall
not be unreasonably withheld.

Section 11.3 Each party grants to the other party a worldwide fully paid
non-exclusive license for use of the other party's intellectual property as
defined in Sections 11.1 and 11.2 for purposes of performing the Work under this
Agreement.

ARTICLE 12  - MISCELLANEOUS

Section 12.1 - Notices. (a) Except as otherwise specified herein, all notices,
requests and other communications required to be delivered to any party
hereunder shall be in writing (including any facsimile transmission or similar
writing), and shall be sent either by certified mail, return receipt requested,
by telecopy or delivered by overnight courier which provides tracking of
documents transported or delivered in person addressed as follows:

(i) If to Orbital, to it at:
    21839 Atlantic Boulevard
    Dulles, Virginia   20166

Telephone: (703)-948-8769
Attention: R. A. Wolak, Director, Contracts

(ii) If to ORBCOMM Inc, to it at:

   21700 Atlantic Boulevard
   Dulles, VA 20166
   Telephone:   (703)-433-6400
   Attention: President & CEO

Or to such other persons or addresses as any party may designate by written
notice to the others. Each such notice, request or other communication shall be
effective (i) if given by telecopy, when such telecopy is transmitted and the
appropriate answer back is received, (ii) if give by reputable overnight
courier, one (b) business day after being delivered to such courier, (iii) if
given by certified mail (return receipt requested), three 3 business days after
being deposited in the mail with first class postage prepaid, or (iv) if given
by any other means, when received at the address specified in this Section 12.1.

Section 12.2 Force Majeure. Neither party shall be responsible for failure or
delay in performance or delivery if such failure or delay is the result of an
act of God, terrorism, riot, or other hostilities, act of the public enemy,
embargo, governmental act, orders or regulations, fire, accident, war, riot,
strikes, inclement weather or other cause of a similar nature that is beyond the
control of the parties. In the event of such occurrence, this Agreement shall be
amended by mutual agreement to reflect an extension in the period of performance
and/or time of delivery necessitated by such circumstances. Failure to agree on
an equitable extension shall be considered a dispute and resolved in accordance
with Section 12.3 hereof.

Section 12.3 - Resolution of Disputes. (a) Any controversy or claim that may
arise under, out of, in connection with or relating to this Agreement or any
breach hereof, shall be submitted to a representative management panel of
ORBCOMM and Orbital. Each of ORBCOMM and Orbital

<PAGE>

may appoint up to two (2) individuals to each panel. Such appointments shall be
made within ten (10) days of the receipt by the appointing party of notice of
the existence of such controversy or claim. The unanimous decision and agreement
of such panel, shall resolve the controversy or claim. If the panel is unable to
resolve such matter within thirty (30) days of the submission of such
controversy or claim to such individuals by way of unanimous decision, either
party may remove the controversy or claim for arbitration in accordance with
Section 12.3(b).

(b) Any controversy or claim that is not resolved under Section 12.3(a) shall be
settled by final and binding arbitration in Washington, D.C., in accordance with
the then existing United States domestic rules of the American Arbitration
Association (the "AAA") to the extent not modified by this Section 12.3. In the
event that claims or controversies arise under this Agreement and any of the
Definitive Agreements, such claims or controversies may be consolidated in a
single arbitral proceeding. Unless otherwise agreed by the parties, the arbitral
tribunal shall be composed of three (3) arbitrators who are expert in satellite
communications systems and/or launch vehicles as may be appropriate depending on
the nature of the dispute. Each of ORBCOMM and Orbital shall appoint one (1)
arbitrator. If any party fails to appoint an arbitrator within thirty (30) days
from the date on which another party's request for arbitration has been
communicated to the first party such appointment shall be made by the AAA. The
two (2) arbitrators so appointed shall agree upon the third arbitrator who shall
act as chairman of the arbitral tribunal. If the two (2) appointed arbitrators
shall not agree upon the appointment of the third arbitrator, such chairman
shall be selected by the AAA. In all cases, the arbitrators shall be fluent in
English. Judgement upon any award rendered by the arbitrators may be entered
into any court having jurisdiction or application may be made for judicial
acceptance of the award and an order of enforcement, as the case may be. The
parties agree that if it becomes necessary for any party to enforce an arbitral
award by a legal action or additional arbitration or judicial methods, the party
against whom enforcement is sought shall pay all reasonable costs and attorneys'
fees incurred by the party seeking to enforce the award.

Section 12.4 - Governing Law. This Agreement shall be construed in accordance
with and governed by the laws of the Commonwealth of Virginia, USA without
giving effect to the provisions, policies or principles thereof relating to
choice or conflict of laws.

Section 12.5 - Binding Effect: Assignment. This Agreement shall be binding upon
and shall inure to the benefit of the parties and their respective successors
and permitted assigns. Neither this Agreement nor any interest or obligations
hereunder shall be assigned or transferred (by operation of law or otherwise) to
any person without the prior written consent of the other party, provided that
any party may assign this Agreement and its interest and obligations hereunder
to any wholly owned subsidiary of such party.

Section 12.6 - Order of Precedence. Inconsistencies between or among Articles of
Agreements and/or any attachment shall be resolved in the following order of
precedence:

 (a) Article 1 through Article 12 of this Agreement
 (b) the Statements of Work: and
 (c) the Specifications.

Section 12.7 - Key personnel. Orbital agrees that those individuals identified
in Exhibit C are necessary for the successful completion of the work to be
performed under this Agreement. Such key personnel shall be removed only after
proper advanced (two weeks minimum) consultation with ORBCOMM. Advanced
consultation shall include identification/qualifications of the replacement and
a transition plan. Orbital shall take considerable effort to replace Key
Personnel with personnel of substantially equal qualifications and ability. In
the event of a dispute, ORBCOMM shall communicate the concern to Orbital's
senior management to negotiate a

<PAGE>

mutually agreed upon alternative. Notwithstanding its role in reviewing Key
personnel adjustments, ORBCOMM shall have no supervisory control over Key
Personnel work, and nothing in this Section 12.7 shall relieve Orbital of any of
its obligations under this Agreement, or of its responsibility for any acts or
omissions of its personnel. To the extent that the Key Personnel voluntarily
resign, ORBCOMM shall be consulted in the selection of the replacement personnel
but shall not have the right to approve such replacement personnel.

Section 12.8 - Counterparts. This Agreement may be executed in any number of
counterparts of the signature pages, each of which shall be considered an
original, but all of which together shall constitute one and the same
instrument.

Section 12.9 - Headings. This section and other headings contained in this
Agreement are for reference purposes only and shall not affect the meaning or
interpretation of this Agreement.

Section 12.10 - Amendment Waiver. Except as provided otherwise herein, this
Agreement may not be amended nor may any rights hereunder by waived except by an
instrument in writing signed by the parties hereto.

Section 12.11 - Entire Agreement. This Agreement and all exhibits (which are
hereby made part of this Agreement) contain the entire understanding between the
parties and supersede all prior written and oral understandings relating to the
subject hereof. No representations, agreement, modifications or understandings
not contained herein shall be valid or effective unless agreed to in writing and
signed by both parties.

Section 12.12 - Modification and Termination. This order may not be modified or
terminated orally. No claimed modification, termination or waiver of any of its
provisions shall be valid UNLESS in writing signed by ORBCOMM.

Section 12.13 - Government Contract Conditions Since this order is being placed
in support of the United States Government contract referenced above, this order
is subject to the following additional provisions:

(a) The terms and conditions of the United States Government Contract;

(b) Inspection at Source: ORBCOMM reserves the right to request Government
Inspection at source. In the event this right is exercised, Orbital shall make
all necessary arrangements with the appropriate Government Agency for such
inspection and shall promptly furnish ORBCOMM with the resultant inspection
certificate(s); and

(c) Government Regulations: The provisions of the Federal Acquisition
Regulations and Defense Department Supplement thereto are incorporated herein by
reference as attached hereto at Exhibit "D." Where necessary to make the context
of these provisions applicable to this order, the term "Government" and
equivalent phrases shall include ORBCOMM, the term "Contractor" shall include
Orbital, and the term "Contract" shall refer to this order. Orbital however,
reserves the right of audit solely to the Government. Where any reference above
contains alternative clauses, that alternative shall apply which is required by
or most consistent with ORBCOMM's prime or subcontract pursuant to which this
order is issued. The clauses set forth above shall be interpreted as referring
to the FAR or DFAR clause with the same or similar name in effect (including
revision by Defense Acquisition Circular) as of the date set forth on ORBCOMM's
prime or subcontract regardless of title or FAR/DFAR numbering. In the event
that this order is placed for a "commercial" product(s) as defined in FAR
52.202-1, only the provisions of the Federal Acquisition Regulations and Defense
Department Supplement thereto set forth at Attachment "A" hereto which are
applicable to commercial item acquisitions shall be applicable hereto. See in
general FAR 52.244-6 and DFAR 252.225.7012.

<PAGE>

Section 12.14 - Equal Opportunity. Orbital agrees during the performance of this
order, pursuant to 41 CFR Section 60-1.4, unless otherwise exempted by law,
rules, regulations, or orders of the United States Government:

1) Orbital will not discriminate against any employee or applicant for
employment because of race, color, religion, sex, or national origin. Orbital
will take affirmative action to ensure that applicants are employed, and that
employees are treated during employment without regard to their race, color,
religion, sex, or national origin. Such action shall include, but not be limited
to the following: Employment, upgrading, demotion, or transfer, recruitment or
recruitment advertising; layoff or termination; rates of pay or other forms of
compensation; and selection for training, including apprenticeship. The Orbital
agrees to post in conspicuous places, available to employees and applicants for
employment, notices to be provided by the contracting officer setting forth the
provisions of this non-discrimination clause.

(2) Orbital will, in all solicitations or advertisements for employees placed by
or on behalf of the Orbital, state that all qualified applicants will receive
consideration for employment without regard to race, color, religion, sex or
national origin.

(3) Orbital will send to each labor union or representative of workers with
which it has a collective bargaining agreement or other contract or
understanding, a notice to be provided by the agency Contracting Officer
advising the labor union or worker's representative of Orbital's commitments
under section 202 of Executive Order 11246 of September 24, 1965, and shall post
copies of the notice in conspicuous places available to employees and applicants
for employment.

(4) Orbital will comply with all provisions of Executive Order 11246 of
September 24, 1965, and of the rules, regulations, and relevant orders of the
Secretary of Labor.

(5) Orbital will furnish all information and reports required by Executive Order
11246 of September 24, 1964, and by the rules, regulations, and orders of the
Secretary of Labor, or pursuant thereto, and will permit access to its books,
records, and accounts by the contracting agency and the Secretary of Labor for
purposes of investigation to ascertain compliance with such rules regulations,
and orders.

(6) In the event of Orbital's non-compliance with the nondiscrimination clauses
of this order or with any of such rules, regulations, or orders, this order may
be canceled, terminated or suspended in whole or in part and Orbital may be
declared ineligible for further Government contracts in accordance with
procedures authorized in Executive Order 11246 of September 24, 1965, and such
other sanctions may be imposed and remedies invoked as provided in Executive
Order 11246 of September 24, 1965, or by rule, regulation, or order of the
Secretary of Labor, or as otherwise provided by law.

(7) Orbital will include the provisions of paragraphs (1) through (7) in every
subcontract or purchase order unless exempted by rules, regulations, or orders
of the Secretary of Labor issued pursuant to section 204 of Executive Order
11246 of September 24, 1965, so that such provisions will be binding upon each
subcontractor or vendor. Orbital will take such action with respect to any
subcontract or purchase order as may be directed by the Secretary of Labor as a
means of enforcing such provisions including sanctions for noncompliance:
Provided, however, that in the event Orbital becomes involved, in, or is
threatened with, litigation with a subcontractor or vendor as a result of such
direction, the Orbital may request the United States to enter into such
litigation to protect the interests of the United States.

Section 12.15 - Segregated Facilities. Orbital hereby certifies that Orbital
does not and will not maintain any facilities Orbital provides for its employees
in a segregated manner, or permit its employees to perform their services of any
location, under Orbital's control, where segregated

<PAGE>

facilities are maintained; and Orbital will provide further certification of
same as may be required by the Director of the Office of Federal Contract
Compliance Programs (OFCCP).

Section 12.16 - False Statements. Orbital acknowledges that whoever knowingly
and willfully makes any false, fictitious or fraudulent representations to the
United States Government either directly or indirectly may be liable to criminal
prosecution under 18 U.S.C. 1001.

Section 12.17 Certification Regarding Debarment, Suspension, Proposed Debarment
and Other Responsibility Matters.

In the event this order is placed in support of a United States Government prime
or subcontract, Orbital herewith certifies to the best of its knowledge and
belief, that it and/or any of its principals

(i.) Are ( ) are not ( ) presently debarred, suspended, proposed for debarment,
or declared ineligible for the award of contracts by a federal agency;

(ii.) Have ( ) have not ( ), within a three year period preceding this offer,
been convicted of or had a civil judgment rendered against them for: commission
of fraud or a criminal offense in connection with obtaining, attempting to
obtain, or performing a public (federal, state or local) contract or
subcontract; violation of federal or state antitrust statutes relating to the
submission of offers; or commission of embezzlement, theft, forgery, bribery,
falsification or destructions of records, making false statements, or receiving
stolen property; and

(iii.) Are ( ) are not ( ) presently indicted for, or otherwise criminally or
civilly charged by a government entity with, commission of any of the offenses
enumerated above. The Orbital has ( ) has not ( ), within a three year period
preceding this offer, had one or more contracts terminated for default by any
federal agency.

"Principals," for the purposes of this certification, means officers, directors,
owners, partners and persons having primary management or supervisory
responsibilities within a business entity (e.g. general manager, plant manager,
head of a subsidiary, division or business segment, and similar positions).

Section 12.18 Severability. If any term, condition, clause or provision of this
order shall be determined or declared to be void or invalid in law or otherwise,
then only that term, condition, clause or provision shall be stricken from this
order and in all other respects this order shall be valid and continue in full
force, effect and operation.

Section 12.19 Waiver. The failure of ORBCOMM at any time to insist on
performance of any provision of this order shall not be construed as a waiver of
that provision in any later instance, nor shall it be construed as a waiver of
any other provision of this order.

Section 12.20 Limitation of Liability. In no event shall either party hold the
other liable for incidental, consequential or punitive damages.

ARTICLE 13 - LIST OF EXHIBITS AND SCHEDULES

Exhibits
Exhibit A      Statement of Work and Specifications
               Part 1A     AIS Demonstration Payload Statement of Work
               Part 1B     Demonstration Spacecraft Communication Payload
                           Specifications
Exhibit B      Work Schedule and Delivery
Exhibit C      Key Personnel
Exhibit D      United States Government Contract Flow Down Provisions
Exhibit E      [***]
Exhibit F      Option Prices
Exhibit G      Schedules

<PAGE>

IN WITNESS WHEREOF, the parties have caused this Agreement to be executed as of
the day and year first above written.

      ORBITAL SCIENCES CORPORATION

      By: /s/ R.A. Wolak
          ---------------------------------
       Name: R. A. Wolak
             Title: Director, Contracts

      ORBCOMM LLC

      By: /s/Jerry Eisenberg
          ---------------------------------
       Name:   Jerry Eisenberg
       Title: Chief Executive Officer
<PAGE>

                                                                  (ORBCOMM LOGO)

                                                                      EXHIBIT 1A

                        ORBCOMM AIS DEMONSTRATION PAYLOAD

                                    STATEMENT
                                       OF
                                      WORK

                                   ORBCOMM LLC
                            21700 Atlantic Boulevard
                         Dulles, Virginia 20166, U.S.A.

<TABLE>
<CAPTION>
                                                    Signature           Date
                                                    ---------           ----
<S>           <C>                                   <C>                 <C>
Prepared      -
By:           Staff
Approved      D. SCHOEN
By:           VP TECHNOLOGY DEVELOPMENT
Approved      J. STOLTE
By:           EVP TECHNOLOGY AND OPERATIONS
</TABLE>

                          Issue Date: November 2, 2004

                               B15051188 - REV New

<PAGE>

                                                                  (ORBCOMM LOGO)

                            EXPORT CONTROL STATEMENT

          The contents of this document, in whole or in part, shall not be
          exported from the United States, which export shall include, but not
          be limited to, transmittal to any non-U.S. citizen wherever said
          person is located, except in accordance with all United States laws
          and regulations relating to exports and to all administrative acts of
          the U.S. Government pursuant to such laws and regulations. Diversion,
          re-export or transshipment of the contents of this document, in whole
          or in part, contrary to U.S. law is also strictly prohibited.

                                      [***]

                               [44 pages omitted]
--------------------------------------------------------------------------------
B15051188 - Revision New                                                       1

                         ORBCOMM PROPRIETARY INFORMATION

<PAGE>

                                                                      EXHIBIT 1B

                                     ORBCOMM
                        CONCEPT DEMONSTRATION SPACECRAFT
                      COMMUNICATIONS PAYLOAD SPECIFICATION

                                   ORBCOMM LLC

                            21700 Atlantic Boulevard
                         Dulles, Virginia 20166, U.S.A.

<TABLE>
<CAPTION>
                                                           Signature      Date
                                                           ---------      ----
<S>            <C>                                         <C>            <C>
Prepared       Communications Payload Engineering
By:
Approved       John Stolte
By:            EVP, Technology & Operations
Approved       Tim Maclay
By:            VP, System Engineering
Approved       Dean Brickerd
By:            VP, Sales and Product Engineering

Approved       Mike Lord
By:            VP, Gateway Engineering
Approved       Chuck Rose
By:            Senior Manager, Network Operations
</TABLE>

                           Issue Date: October 6, 2004

                                B15051189 - REV D

<PAGE>

                                                                  (ORBCOMM LOGO)

                            EXPORT CONTROL STATEMENT

          The contents of this document, in whole or in part, shall not be
          exported from the United States, which export shall include, but not
          be limited to, transmittal to any non-U.S. citizen wherever said
          person is located, except in accordance with all United States laws
          and regulations relating to exports and to all administrative acts of
          the U.S. Government pursuant to such laws and regulations. Diversion,
          re-export or transshipment of the contents of this document, in whole
          or in part, contrary to U.S. law is also strictly prohibited.

                                      [***]

                               [54 pages omitted]
<PAGE>

                                    Exhibit B
                           Work Schedule and Delivery

Basic Contract:

            Deliver one (1) each Demo Payload as defined in ARTICLE 1 and
            Exhibit A will be twelve (12) months after contract effectiveness as
            define in ARTICLE 12.5.

            Delivery of all services, reviews and equipment will be in
            accordance with Appendix A, Deliverable Services, Reviews and
            Equipment.

            Delivery of all documentation will be in accordance with Appendix B,
            Documentation Requirements List.

Options:

            Delivery of the optional equipment will be in accordance with the
            following schedules:

            Option A: Option for up to five (5) Additional AIS Payload
            configured identically as Demo Payload defined in Exhibit A.

            Delivery will be twelve (12) months after receipt of ORBCOMM's
            election to exercise the option and the first milestone payment
            (TBD) for this option. Option must be exercised within one hundred
            and twenty (120) days of the effective date of the contract.

            Option B: Option for six (6) ORBCOMM Spacecraft similar to existing
            Plane B configuration with integrated AIS Payloads configured
            identically as Demo Payload defined in Exhibit A.

            Delivery will be eighteen (18) months after receipt of ORBCOMM's
            election to exercise the option and the first milestone payment of
            (TBD) for this option.

            Option exercise dates are as stated in Exhibit F.

            Option C: Option for six (6) ORBCOMM Spacecraft with ORBCOMM Payload
            similar to existing Plane B configuration without AIS Payloads.

            Delivery will be eighteen (18) months after receipt of ORBCOMM's
            election to exercise the option and the first milestone payment of
            (TBD) for this option.

            Option exercise dates are as stated in Exhibit F.

<PAGE>

                                    Exhibit C
                                  Key Personnel

The following individuals will be assigned to the Demo Payload Agreement effort
in accordance with the provisions of ARTICLE 12.7

Program Manager             Tom McDermott

Systems Engineer            Thierry Guichon

Contract Administrator      Ron Wolak

<PAGE>

                                   EXHIBIT D.
                              FAR FLOW DOWN CLAUSES

********************************************************************************

<TABLE>
<CAPTION>
ITEM  CLAUSE #    FAR TITLE                                           DATE     APPLICATION
----  --------    ---------                                           ----     -----------
<S>   <C>         <C>                                                 <C>      <C>
1.    52.203-3    Gratuities                                          APR 84   Over SAT
2.    52.203-6    Restriction on Subcontractor Sales                  JUL 95   Over SAT to the Government
3.    52.203-7    Anti-Kickback Procedures                            JUL 95   Over SAT *
4.    52.203.10   Price or Fee Adjustment for Illegal or              JAN 97   All Improper Activity
5.    52.203-11   Certification and Disclosure Regarding Payments     APR 91   Over $100,000.0 to Influence Certain Federal
                                                                               Transactions

6.    52.203-12   Limitation on Payments to Influence Certain         JUN 03   All Federal Transactions
7.    52.204-2    Security Requirements                               AUG 96   All
8.    52.209-6    Protecting the Government's Interest                JUL 95   Over $25,000.00, Subcontracting w/ Contractors
                                                                               Debarred, Suspended, or Proposed for Debarment
9.    52.214-26   Audit and Records- Sealed Bidding                   OCT 97   Over $500,000.00
10.   52.214-28   Subcontractor Cost or Pricing Data                  OCT 97   Over $500,000.00 Modifications - Sealed Bidding
11    52.215-2    Audit and Records - Negotiation                     JUN 99   Over SAT *
12.   52.215-10   Price Reductions for Defective Cost or Pricing      OCT 97   over $500,000.00 and Data FAR 15.403-4 exceptions n/a
13.   52.215-11   Price Reductions for Defective Cost or Pricing      OCT 97   Over $500,000.00 Data - Modifications and
                                                                               FAR 15.403-4 Exceptions N/A
14.   52.215-12   Subcontractor Cost or Pricing Data                  OCT 97   Over $500,000.00
15.   52.215-13   Subcontractor Cost or Pricing Data - Modifications  OCT 97   Over $500,000.00
16.   52.215-14   Integrity of Unit Prices                            OCT 97   Over $500,000.00 and FAR 15.403-4 Exceptions N/A
17.   52.215-15   Pension Adjustments and Asset Reversions            JAN 04   If Cost&Pricing Data Required Per FAR 15.408(g)
18.   52.215-18   Reversions or Adjustments of Plans for Post         OCT 97   If Cost & Pricing Data Retirement Benefits (PRB)
                                                                               Other than Pensions Required
19.   52.215-19   Notification of Ownership Change                    OCT 97   If FAR 15.408(k) applicable
20.   52.215-21   Requirements for Cost or Pricing Data or            OCT 97   If Cost & Pricing Data Req'd Information Other than
                                                                               Cost or Pricing Data -Modifications
21.   52.219-8    Utilization of Small Business Concerns              OCT 00   If further subcontract opportunities exist.
22.   52.219-9    Small, Small Disadvantaged and Women-Owned          JAN 02   Over $500,000.00 Small Business Subcontracting Plan
23.   52.222-4    Contract Work Hours & Safety Standards Act -        SEPT 00  Over $100,000.00 Overtime Compensation
</TABLE>

<PAGE>

<TABLE>
<S>   <C>         <C>                                                 <C>       <C>
24.   52.222-21   Prohibition of Segregated Facilities                FEB 99    Over$100,000.00
25.   52.222-26   Equal Opportunity                                   APR 02    Over $10,000.00
26.   52.222-35   Equal Opportunity for Special Disabled Veterans,    DEC 01    Over $25,000.00 Veterans of the Vietnam Era, and
                                                                                Veterans and Other Eligible Veterans
27.   52.222-36   Affirmative Action for Workers with disabilities    JUN 98    Over $10,000.00
28.   52.222-37   Employment Reports on Special Disabled Veterans     DEC 01    $25,000.00 or more and Veterans of the Vietnam Era
29..  52.223-3    Hazardous Material Identification                   JAN 97    All requiring delivery of & Material Safety Data
                                                                                hazardous materials
30.   52.224-2    Privacy Act                                         APR 84    All
31.   52.225-8    Duty-Free Entry                                     FEB 00    If SK includes covered supplies
32.   52.225-13   Restrictions on Certain Foreign Purchases           JAN 04    All
33.   52.227-1    Authorization and Consent                           JUL 95    Above SAT * (Unless outside USA)
34.   52.227-2    Notice and Assistance Regarding                     AUG 96    Above SAT * Patent & Copyright Infringement (Unless
                                                                                outside USA)
35.   52.227-3    Patent Indemnity                                    APR 84    All
36..  52.227-6    Royalty Information                                 APR 84    If Cost & Pricing Data or Royalty Information
                                                                                Required
37.   52.227-9    Refund of Royalties                                 APR 84    If C.O. determines substantial amounts of
                                                                                royalties may have to be paid
38.   52.227-10   Filing of Patent Applications -                     APR 84    Certain experimental, Classified Subject Matter
                                                                                developmental, or research
39.   52.227-11   Patent Rights - Retention by the Contractor         JUN 97    Certain experimental (Short Form) developmental, or
                                                                                research  Over SAT* w/exceptions
40.   52.227-12   Patent Rights - Retention by the Contractor         JAN 97    Certain experimental, (Long Form) developmental, or
                                                                                research
41.   52.227-13   Patent Rights - Acquisition by the Government       JAN 97    Certain experimental, developmental, or research
42.   52.227-17   Rights in Data - Special Works                      JUN 87    If in Prime Contract
43.   52.228-5    Insurance - Work on a Government Installation       JAN 97    Over SAT*, w/exceptions
44.   52.230-2    Cost Accounting Standards                           APR 98    Negotiated contracts with enumerated exceptions
45.   52.230-3    Disclosure and Consistency of                       APR 98    Over $500,00.00, under Cost Accounting Practices
                                                                                $25 million, eligible for CAS coverage (unless UK)
</TABLE>

<PAGE>

<TABLE>
<S>   <C>         <C>                                                 <C>       <C>
46.   52.230-6    Administration of  Cost Accounting Standards        NOV 99    Negotiated contracts with enumerated exceptions
47.   52.244-6    Subcontracts for Commercial Items                   APR 03    All SK's where clause is in prime contract
48.   52.245-17   Special Tooling                                     JUN 03    Fixed-price, tooling provided by/rights acquired by
                                                                                Gov't
49.   52.245-18   Special Test Equipment                              FEB 93    Negotiated; Contractor to acquire/fabricate
                                                                                special test equipment yet unknown
50.   52.246-23   Limitation of Liability                             FEB 97    All non-high-value (normally under $100,000.00) end
                                                                                items via contracts over SAT *
51.   52.247-63   Preference for US-Flag Air Carriers                 JUN 03    All/w possible intl air transport
52.   52.247-64   Preference for Privately Owned                      APR 03    All that may involve ocean U.S.-Flag Commercial
                                                                                Vessels transport under Cargo Preference Act;
                                                                                transport otherwise required by such vessels
                                                                                w/ltd commercial item exception
53.   52.248-1    Value Engineering                                   FEB 00    If in prime contract and $100,000.00+; less if
                                                                                potential for significant savings.
54.   52.212-4    Contract Terms and Conditions - Commercial Items    OCT 2003
55.   52.244-6    Subcontracts for Commercial Items                   APR 2003
</TABLE>

* "Over SAT" indicates that the referenced clause applies to all contract over
  the Simplified Acquisition Threshold. FAR 2.101; see FAR 3.503-2

<PAGE>

                                    Exhibit E

                                      [***]

<PAGE>

                                    Exhibit F
                                  Option Prices

Option Prices:

            Option A: Option for up to five (5) Additional AIS Payload
            configured identically as Demo Payload defined in Exhibit A. Each
            additional AIS payload ordered beyond the one (1) Demo Payload will
            be provided at a Firm Fixed-Price of $3,000,000 each.

            Option B:

            Option for six (6) ORBCOMM Spacecraft similar to existing Plane A
            configuration with integrated AIS Payloads configured identically as
            Demo Payload defined in Exhibit A, the following Firm Fixed-Prices
            apply:

            If exercised before 15 December 2004: $34,400,000
            If exercised before 30 January 2005:  $34,650,000
            If exercised after 30 January 2005:
            but before 28 February 2005:          $34,900,000

            Option C:

            Option for six (6) ORBCOMM Spacecraft with ORBCOMM Payload similar
            to existing Plane A configuration the following Firm Fixed-Prices
            apply:

               If exercised before 15 December 2004: $32,600,000
               If exercised before 30 January 2005:  $32,850,000
               If exercised after 30 January 2005:
               but before 28 February 2005:          $33,100,000

Special Option Provision:

ORBCOMM may decide to exercise Option B during the period of performance of the
Demo Payload and utilize the Demo Payload as one of the six (6) AIS Payloads to
be delivered as one of the six (6) integrated AIS / ORBCOMM Spacecraft in Option
B. Upon the Termination for Convenience for the Demo Payload, Orbital will
retain all payments received to date and an adjustment (either upward or
downward) to Option B Price will be negotiated prior to the commencement of the
Option B effort.<PAGE>

                                                                    Exhibit 10.5

                                      *** TEXT OMITTED AND FILED SEPARATELY
                                          CONFIDENTIAL TREATMENT REQUESTED
                                          UNDER 17 C.F.R. SECTIONS 200.80(b)(3),
                                          200.80(b)(4) AND 230.406

                               Amendment Number 1

    ORBCOMM CONCEPT DEMONSTRATION COMMUNICATION PAYLOAD PROCUREMENT AGREEMENT
          B10LG1192 dated 3 November 2004 (THE "PROCUREMENT AGREEMENT")

This Amendment to the Procurement Agreement (this "Amendment") is made and
entered into as of the 21st day of April, 2006 between ORBCOMM Inc, a Delaware
corporation ("ORBCOMM") with its principal place of business located at 21700
Atlantic Boulevard, Dulles, VA 20166 and Orbital Sciences Corporation, a
Delaware corporation ("Orbital") with its principal place of business located at
21839 Atlantic Boulevard, Dulles, Virginia 20166 and constitutes the exercise
Option A of the Procurement Agreement, as modified herein. Capitalized terms not
otherwise defined herein shall have the meanings ascribed to them in the
Procurement Agreement. References herein to the Procurement Agreement shall be
deemed to include all Exhibits thereto provided that each of Exhibits A
(Specifications), B (Statement of Work), C (Key Personnel) and E (Milestone
Payments and T&M Billing Rates) are, for purposes hereof, replaced in their
entirety by Exhibits A-1, B-1, C-1 and E-1 hereto and references herein and in
the Procurement Agreement to these Exhibits shall be deemed to refer to such
revised Exhibits. This Amendment becomes effective on the date both parties have
signed this Amendment and the amount of the first Milestone Payment as defined
in Exhibit E-1 is received from ORBCOMM (the "Effective Date" or "AED").

WITNESSETH

WHEREAS ORBCOMM wishes to procure from Orbital, and Orbital wishes to supply to
ORBCOMM, six (6) additional Automatic Identification System (AIS) Signal
payloads as set forth herein.

WHEREAS, ORBCOMM and Orbital have agreed to amend certain particulars of the
Procurement Agreement as shall apply to this additional procurement.

NOW, THEREFORE, in consideration of the foregoing and for other valuable
considerations the receipt and adequacy of which each party hereby acknowledges,
the parties hereby agree as follows:

1. Additional Payloads. Orbital shall design, manufacture, test and deliver one
(1) payload (without antenna) engineering development unit (the "EDU Unit") and
six (6) additional Automatic Identification System (AIS) Signal payloads (the
"Additional Payloads") in accordance with the Statement of Work and
Specifications attached hereto, including (without limitation) the delivery
schedule set forth in Section 2.1.1 of the SOW (the "Delivery Schedule"). Except
where expressly stated otherwise herein, references herein to the Additional
Payloads shall be deemed to include the antenna subsystems associated therewith.

<PAGE>

                                       -2-

2. Price. The firm fixed price for the six (6) Additional Payloads, each with an
additional SRX, shall total $17,000,000 (the "Price"), which ORBCOMM shall pay
Orbital, in accordance with Exhibit E-1 of this Amendment. Orbital acknowledges
and agrees that it shall provide all associated deliverables, including the EDU
Unit, documentation, and services, as specified in the Procurement Agreement,
this Amendment, and the SOW without additional charge, except if and to the
extent that a particular task is expressly stated as being subject to additional
payment for time and material expenses. Completion of the payment milestones
with respect to the Additional Payloads is set forth on Exhibit E-1 hereto (the
"AP Milestones"). Completion of AP Milestones shall be determined as described
in Section 5.3 of the Procurement Agreement.

3. Price Adjustments. Without prejudice to any other applicable rights and
remedies under the Procurement Agreement, the following price adjustments shall
apply to the Additional Payloads:

     (i) Late Delivery. If one or more of the Additional Payloads is not
delivered in accordance with the requirements of this Amendment within fourteen
(14) months of the Effective Date plus sixty (60) days grace period (no penalty
shall be incurred in the grace period) for the Additional Payloads (less the
antenna subsystem) and fourteen (14) months plus ninety (90) days grace period
for the antenna subsystem associated therewith, starting on the first day after
such applicable grace period has been exhausted, Orbital shall pay ORBCOMM
liquidated delay damages of [***]% ($[***]) per day for each Additional Payload
that has not been so delivered for each day of delay, up to a total amount not
to exceed [***] percent ([***]%) of the Price ($[***]) and not to exceed $[***]
per day and inclusive of the penalties described in clause 3.(iv) below.

     (ii) On Time or Early Delivery. If the EDU Unit and all of the Additional
Payloads are delivered in accordance with the requirements of this Amendment by
the date specified in the Delivery Schedule, ORBCOMM shall pay Orbital a single
on-time delivery incentive of 1.2% of the Price ($204,000). In addition, if all
of the Additional Payloads are so delivered on time, for each day that the
Additional Payloads are so delivered early, ORBCOMM shall pay Orbital 0.01% of
Price ($1700) per day of early delivery, up to a total amount not to exceed
$100,000 for such early delivery (for all Additional Payloads combined).

     (iii) Calculation of On-time, Late and Early Delivery. Timely delivery of
an Additional Payload shall require the timely delivery of both the payload unit
(without the antenna) and the associated antenna (A) within fourteen (14) months
of the Effective Date plus sixty (60) days grace period for the Additional
Payloads (less the antenna subsystem) and fourteen (14) months plus ninety (90)
days grace period for the antenna subsystem associated therewith, for purposes
of clause 3(i) above and (B) in accordance with the Delivery Schedule for
purposes of clause 3(ii) above. For purposes of calculating late delivery
penalties, however, late deliveries of separate items associated with the same
Additional Payload shall be determined by the greatest lateness of any single
item, but shall not be additive. For example, if the first flight

<PAGE>

                                       -3-

Additional Payload (less the antenna subsystem) is delivered seventy-five (75)
days late, and the first flight antenna subsystem is delivered one hundred (100)
days late, the late charge shall be calculated on the basis that the first
Additional Payload was delivered seventy-five (75) days late, or fifteen (15)
days worth of late charges.

          Conversely, for purposes of calculating early delivery incentives, the
least early item associated with a particular Additional Payload shall be
controlling. Accordingly, if the EDU is delivered twenty (20) days early; the
first flight payload (less antenna) is delivered ten (10) days early, and the
first flight antenna is delivered five (5) days early (and assuming all the
Additional Payloads were delivered on time), the early delivery incentive shall
be calculated on the basis of the first Additional Payload having been delivered
five (5) days early.

          If and to the extent that a delay in delivery is excused by force
majeure then Orbital shall not be responsible for late charges under clause 3(i)
above for the period of such force majeure delay. The time required for delivery
in order for Orbital to achieve on-time or early delivery incentives under
clause 3(ii) above shall, however, not be extended by force majeure delays.

     (iv) Power and Weight. If ORBCOMM agrees to accept Additional Payloads that
exceed the maximum operating power and/or weight limits set forth in the
Specifications, then Orbital shall pay ORBCOMM as compensation therefor, $10,000
per Kg in excess of 20.31 Kg (inclusive of 1kg grace) for the total Additional
Payload mass as set forth in Section 4.5.4 of the Specifications and $10,000 per
5 watts in excess of 120 watts (inclusive of 5 watts grace) of total Additional
Payload power as set forth in Section 4.5.5 of the Specifications, in each case
per Additional Payload, and in each case pro rated for partial amounts in excess
of such maximum weight and/or power. The maximum payment that shall be paid for
exceeding the power and/or weight limits shall not exceed $100,000.

     (v) Additional Environmental Testing of the Integrated Flight Payloads. If
ORBCOMM directs (in writing) Orbital to perform the additional environmental
testing for flight payloads as set forth in Section 6.3.2.2 of the SOW, ORBCOMM
shall pay Orbital an additional amount of $94,000 for the first Additional
Payload so tested at ORBCOMM's direction and an amount of $26,000 for each
subsequent Additional Payload thereafter. In addition, Orbital shall be allowed
up to fourteen (14 days of schedule relief as necessary to accomplish such
testing. ORBCOMM's direction for this additional testing must be received within
six (6) months after the Effective Date.

     (vi) Time and Material Charges. All time and material charges, if
applicable, shall be calculated in accordance with Exhibit E-1 hereto. Where
insofar in this regard it becomes necessary to calculate "costs," costs shall be
limited to reasonable, out of pocket, and documented costs actually incurred,
and only insofar as the costs exceed the cost that would have had to been
incurred by Orbital in any event without additional charge.

<PAGE>

                                       -4-

     (vii) Holdback Charge. As shown in Exhibit E-1, four percent (4%) of the
Price ($680,000) (the "Holdback Amount") shall be held back by ORBCOMM until
one-year (12 months) after the successful completion of payload IOT for the
Additional Payloads. Said Holdback Amount shall be paid by ORBCOMM to Orbital if
all of the Additional Payloads are successfully operating in accordance with
their Specifications on said first anniversary date. In order to holdback such
amounts, ORBCOMM shall, not later than thirty (30) days prior to launch, deliver
to ORBITAL a performance bond or letter of credit to receive such payment,
failing which ORBCOMM shall make the Holdback Payment to Orbital or a mutually
agreeable third party escrow agent at that time, but subject to refund by
Orbital (or release to ORBCOMM by such escrow agent), on a pro rata basis, if
one or more of the Additional Payloads are not so successfully operating on said
first anniversary date.

4. Additional Options. ORBCOMM shall have the option to require Orbital to
manufacture, test and deliver to ORBCOMM up to two (2) Additional Payloads (in
addition to those delivered pursuant to clause 1 above) in accordance with the
SOW and the Specifications (the "Optional Payloads"). The firm fixed price for
each Optional Payload, each with an additional SRX, shall be $2,200,000.
Delivery of each Optional Payload(less the antenna subsystem) will be fourteen
(14) months (plus sixty (60) days grace period) and fourteen (14) months (plus
ninety (90) days grace period) for the antenna subsystem associated therewith,
after ORBCOMM's written direction is received exercising this option and the
first milestone payment for each Optional Payload in the amount of $200,000 is
received. The payment schedule for the Optional Payloads shall correspond as
closely as possible (in terms of time and percentage of total price) to the AP
Milestones set forth on Exhibit E-1. This option must be exercised, if at all
and at ORBCOMM's sole discretion, no later than three (3) months after the
Effective Date with respect to each Additional Option. This option may be
exercised by ORBCOMM in whole or in part. Except as specified above, all
references herein to Additional Payloads shall be deemed to include the Optional
Payloads to the extent this option is exercised by ORBCOMM.

5. Taxes, Delivery, Title. Orbital shall be responsible for all United States
(including political subdivisions) tax payments, liabilities, or claims required
by present or future laws and regulations. ORBCOMM shall be responsible for all
non-U.S. (including political subdivisions) taxes, liabilities, or claims, and
any customs duties, if any, levied upon or measured by the sale, the sales
price, or the use of the equipment deliverable under this Amendment required by
present or future laws and regulations. Transfer of title to each deliverable
item will pass to ORBCOMM prior to each deliverable item entering non-U.S.
territory and after each deliverable item leaves the United States. Orbital
shall agree to make reasonable changes in the Procurement Agreement and this
Amendment, such as modifying the place of delivery and/or delaying the passage
of title, as ORBCOMM may request in writing, in order to improve the tax
efficiencies with respect to the Additional Payloads, provided that any such
change shall be economically neutral to Orbital. ORBCOMM shall indemnify and
hold harmless Orbital from and against any damages as a result of Orbital
holding title to any Additional Payloads following delivery thereof to the
shipper at Orbital's facility.

<PAGE>

                                       -5-

6. Payment Terms and Invoicing. Section 5.1 - Invoicing of the Procurement
Agreement is hereby amended to add the following after the second sentence: "
Payments shall be due net 10 days for those payments defined in Exhibit E-1".

7. Insurance. Orbital shall, at ORBCOMM's request, provide reasonable assistance
to ORBCOMM, in seeking to obtain launch and/or in-orbit insurance and/or in
pursuing any claim thereunder, including participating in a reasonable number of
technical presentations to insurers and providing such documentation as may be
reasonably requested.

8. Corrections. The fourth sentence of Section 6.2 of the Procurement Agreement
is hereby amended to be consistent with the last sentence of Section 6.3(a),
..i.e., the decision as to how corrections shall be mutually agreed by ORBCOMM
and Orbital. In addition, if integration testing reveals defects in the
Additional Payloads resulting from a defect in workmanship or materials or
noncompliance with the SOW or Specifications, Orbital shall be responsible, at
its own expense, for the timely repair and correction of the Additional
Payloads, if practical at the facility of the integrator (with the time spent by
its personnel not charged against then allocated time to ORBCOMM) and if not, at
Orbital's facilities, with all transportation, insurance, and risk of loss in
transit to and from the integrator's facilities and those of Orbital borne by
Orbital. If such remedies are required, the elapsed time needed to remedy such
defects or noncompliance shall be added to the actual delivery date to establish
the delivery of such items for the purpose of calculating a revised delivery
date for the purpose of assessing incentives and penalties. For example, if an
Additional Payload is delivered in AED plus 330 days, such a defect or
noncompliance is revealed in AED plus 360 days and remedied by AED plus 380
days, delivery shall have been deemed to occur on AED plus 350 days (i.e. 20
additional days) for the purpose of assessing incentives and penalties under
clauses 3(i) and 3(ii) above.

9. Security Interest; Property Accounting; Source Code Escrow. As collateral for
the timely performance by Orbital of its work hereunder, Orbital hereby grants
to ORBCOMM a first priority security interest in the work and work in progress
and any proceeds therefrom with respect to the Additional Payloads. ORBCOMM
agrees to execute any release of such security interest when Orbital has
transferred to it title to the Additional Payloads and all deliverables
associated therewith. Orbital shall execute such documentation thereof as
ORBCOMM may reasonably request. Supplies, prints, materials, components,
subsystems, and systems as associated with such work shall be properly
inventoried and identified as associated with such work in accordance with
Orbital's normal inventory control practice, documentation of which shall be
subject to inspection by ORBCOMM, and shall not be redeployed to other programs
without ORBCOMM's consent.

     Orbital shall, in addition, contemporaneously with its entry into this
Amendment, execute (as the "Depositor") and thereafter perform the obligations
of a Depositor under the "Preferred Escrow Agreement" with Iron Mountain and
ORBCOMM (as the "Preferred Beneficiary"), attached hereto as Exhibit G. ORBCOMM
agrees that it shall pay Iron Mountain's fees under the Preferred Escrow
Agreement. Subject to

<PAGE>

                                       -6-

ORBCOMM's obligation to pay Iron Mountain's fees, Orbital agrees that ORBCOMM
shall have the right to adjust the level of work to be performed by Iron
Mountain and/or terminate the Preferred Escrow Agreement in accordance with its
terms and Orbital shall execute and deliver such instructions to Iron Mountain
as ORBCOMM may reasonably request to reflect ORBCOMM's decisions in this regard.

10. Legal Compliance. Each Party shall comply with all applicable laws and
regulations with respect to the performance of this Amendment.

11. Specific Performance. Nothing in the Procurement Agreement or this Amendment
shall be deemed to bar either party from seeking specific performance of the
other party's obligations hereunder.

12. Force Majeure. The force majeure provision of the Procurement Agreement is
hereby replaced with the following:

"Section 12.2 Force Majeure. Neither party shall be responsible for failure or
delay in performance or delivery if such failure or delay is the result of an
act of God, terrorism, riot, or other hostilities, act of the public enemy,
embargo, governmental act, orders or regulations, fire, war, riot, strikes,
hurricane or other catastrophic weather condition, delay of spacecraft bus for
integration, delay of launch or other cause of a similar nature that is beyond
the control of such party claiming force majeure. In the event of such
occurrence, this Agreement shall be amended by mutual agreement to reflect an
extension in the period of performance and/or time of delivery necessitated by
such circumstances. Failure to agree on an equitable extension shall be
considered a dispute and resolved in accordance with Section 12.3 hereof. Any
failure or delay that could have been avoided or greater minimized by the
exercise of commercially reasonable diligence and care (including work around
solutions to minimize the effect of a force majeure event)."

13. Key Personnel. Exhibit C to the Procurement Agreement is hereby updated as
it relates to the work to be performed for the Additional Payloads by Exhibit
C-1 hereto.

14. Public Announcement. Except as may be required by applicable laws, neither
party will make a public announcement regarding this Amendment without the
approval of the other party, which approval will not be unreasonably withheld.

15. Statement of Work. A revised Statement of Work ("SOW") with respect to the
Additional Payloads and all associated deliverables, documentation and services
is attached hereto as Exhibit B-1.

16. Specifications. Revised Specifications ("Specifications") with respect to
the Additional Payloads and all associates deliverables, documentation and
services are attached hereto as Exhibit A-1.

17. Rights and Obligations under Procurement Agreement. Except insofar as the
terms and conditions of the Procurement Agreement, including all associated
exhibits,

<PAGE>

                                       -7-

may be expressly in conflict with the terms and conditions of this Amendment,
the terms and conditions of such Procurement Agreement (also sometimes
internally referenced therein) shall remain in full force and effect and apply,
in context, to the parties' rights and obligations vis-a-vis the Additional
Payloads. In the event of any inconsistency or contradiction between the terms
of this Amendment and the Procurement Agreement, the provisions of this
Amendment shall prevail and control. On and after the date hereof each reference
in the Procurement Agreement to (a) "this Agreement", "this order", "herein", or
words of like import shall mean and be a reference to the Procurement Agreement
as amended hereby; (b) "Milestone(s)" shall mean "AP Milestone(s)" for purposes
of the AP Milestones; and (c) "Payload" (including without limitation in both
clauses (a) and (b) of Section 2.4 of the Procurement Agreement) shall be deemed
to refer to each Additional Payload.

IN WITNESS WHEREOF, the parties have caused this Amendment to be executed as of
the day and year first above written.

ORBITAL SCIENCES CORPORATION

By: /s/ R.A. Wolak
    ---------------------------------
Name: R. A. Wolak
Title: Director, Contracts

ORBCOMM Inc.

By: /s/ Jerry Eisenberg
    ---------------------------------
Name: Jerry Eisenberg
Title: Chief Executive Officer

<PAGE>

                                     ORBCOMM
                       QUICK LAUNCH PAYLOAD SPECIFICATION

                                   ORBCOMM LLC

                            21700 Atlantic Boulevard
                         Dulles, Virginia 20166, U.S.A.

<TABLE>
<CAPTION>
                                                     Signature           Date:
                                                     ---------           -----
<S>        <C>                                  <C>                   <C>

Prepared   Gene. Fujii

By:        Manager Spacecraft Development
                                                -------------------   ----------

Approved   Tony Robinson

By:        VP, Space Segment
                                                -------------------   ----------

Approved   John Stolte

By:        EVP, Technology & Operations
                                                -------------------   ----------

Approved   Tim Maclay

By:        VP, System Engineering
                                                -------------------   ----------

Approved   Dean Brickerd

By:        VP, Sales and Product Engineering
                                                -------------------   ----------

Approved   Mike Lord

By:        VP, Gateway Engineering
                                                -------------------   ----------

Approved   Chuck Rose

By:        Senior Manager, Network Operations
                                                -------------------   ----------
</TABLE>

                           Issue Date: April 21, 2006

<PAGE>

Quick Launch Payload Specification

                            EXPORT CONTROL STATEMENT

The contents of this document, in whole or in part, shall not be exported from
the United States, which export shall include, but not be limited to,
transmittal to any non-U.S. citizen wherever said person is located, except in
accordance with all United States laws and regulations relating to exports and
to all administrative acts of the U.S. Government pursuant to such laws and
regulations. Diversion, re-export or transshipment of the contents of this
document, in whole or in part, contrary to U.S. law is also strictly prohibited.

                                      [***]

                               [52 pages omitted]
<PAGE>

                                     ORBCOMM
                              QUICK LAUNCH PAYLOAD

                                    STATEMENT
                                       OF
                                      WORK

                                   ORBCOMM LLC
                            21700 Atlantic Boulevard
                         Dulles, Virginia 20166, U.S.A.

<TABLE>
<CAPTION>
                                                  Signature            Date:
                                                  ---------            -----
<S>        <C>                              <C>                    <C>

Prepared   G. FUJII

By:        MANAGER SPACECRAFT DEVELOPMENT
                                            --------------------   -------------

Approved   T. ROBINSON

By:        VP SPACE SEGMENT
                                            --------------------   -------------

Approved   J. STOLTE

By:        EVP TECHNOLOGY AND OPERATIONS
                                            --------------------   -------------
</TABLE>

                           Issue Date: April 21, 2006

<PAGE>

                                                              (ORBCOMM (R) LOGO)
                                                         GLOBAL DATA & MASSAGING

                          ORBCOMM QUICK LAUNCH PAYLOAD

                                    STATEMENT
                                       OF
                                      WORK

                                   ORBCOMM LLC

                            21700 Atlantic Boulevard
                         Dulles, Virginia 20166, U.S.A.

                           Issue Date: April 21, 2006

<PAGE>

ORBCOMM Quick Launch Payload
Statement of Work

                            EXPORT CONTROL STATEMENT

The contents of this document, in whole or in part, shall not be exported from
the United States, which export shall include, but not be limited to,
transmittal to any non-U.S. citizen wherever said person is located, except in
accordance with all United States laws and regulations relating to exports and
to all administrative acts of the U.S. Government pursuant to such laws and
regulations. Diversion, re-export or transshipment of the contents of this
document, in whole or in part, contrary to U.S. law is also strictly prohibited.

                                      [***]

                               [46 pages omitted]
<PAGE>
                                    Exhibit C
                                  Key Personnel

The following individuals will be assigned to the Quick Launch Program in
accordance with the provisions of Section 12.0

Program Manager   Robert Lockwood

Technical Manager Thierry Guichon

<PAGE>

                                   Exhibit E-1

                                      [***]

                               [2 pages omitted]

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