Document:

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                                                                   EXHIBIT 10.18

                             UNCONDITIONAL GUARANTY

      FOR VALUE RECEIVED, SEA ELECTRONICS, INC., an Oklahoma corporation
("Guarantor"), guarantees unconditionally the full and prompt payment to SHAWMUT
CAPITAL CORPORATION, a Connecticut corporation ("Lender"), at Lender's office
in Dallas County, Texas, upon demand, of the following obligations and
indebtedness of LOWRANCE ELECTRONICS, INC., a Delaware corporation ("Lowrance"),
LEI EXTRAS, INC., a Delaware corporation ("LEI"), LOWRANCE AUSTRALIA PTY
LIMITED, a New South Wales, Australia corporation ("Lowrance Australia") (ACN
050 050 612), and LOWRANCE CONTRACTS, INC., a Delaware corporation ("Lowrance
Contracts") (individually and collectively referred to herein as "Borrower"):

      Any and all indebtedness and obligations, whether direct or indirect,
absolute or contingent, primary or secondary, joint or several, and all
renewals, modifications and extensions thereof for which Borrower, is now, or
hereafter may become liable or indebted to Lender, whether by lapse of time,
acceleration of maturity, on account of (i) the Obligations, as defined in that
certain Loan and Security Agreement, dated December 15, 1993, between Borrower
and Lender (as successor by assignment to Barclays Business Credit, Inc.) as
amended by the First Amendment to Loan and Security Agreement, dated as of
October 16, 1995 among Lender, Guarantor and Borrower (as amended, the "Loan
Agreement"), outstanding prior to the date hereof; (ii) any document executed in
connection with or as security for payment of such Obligations or any renewal,
extension, or modification thereof; and (iii) all costs, attorneys' fees, and
other expenses incurred by Lender by reason of any default by Borrower under any
of the foregoing (all of the foregoing are hereinafter referred to as the
"Obligations"). The Obligations referred to in clause (i) above shall be
determined in accordance with Section 1.6 of the Loan Agreement.

      At the time Guarantor pays any sum which may become due Lender under the
terms of this Unconditional Guaranty (this "Guaranty"), written notice of such
payment shall be delivered to Lender by Guarantor, and in the absence of such
notice, any sum received by Lender on account of any of the Obligations shall be
conclusively deemed paid by Borrower. All sums paid Lender by Guarantor may be
applied by Lender at its discretion upon any of the Obligations. To further
secure payment of the Obligations, Guarantor grants to Lender, in addition to
all other contractual, legal, and equitable rights of Lender, the right to
offset against any account, certificate of deposit, or other funds of Guarantor
in the possession of or under the control of Lender.

      Guarantor hereby waives notice of acceptance of this Guaranty and all
other notices in connection herewith or in connection with the Obligations,
including, without limitation, notice of intent to accelerate and notice of
acceleration, and waives diligence, presentment, demand, protest, and suit on
the part of Lender in the collection of any of the Obligations, and agrees that
Lender shall not be required to first endeavor to collect any of the Obligations
from Borrower, or any other party liable for payment of the Obligations
(hereinafter referred to as an "Obligated Party"), before requiring Guarantor to
pay the full amount of the Obligations. Without impairing

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the rights of Lender against Guarantor, Borrower or any other Obligated Party,
suit may be brought and maintained against Guarantor at the election of Lender
with or without joinder of Borrower, or any other Obligated Party, any right to
any such joinder being hereby waived by Guarantor.

      Guarantor acknowledges and represents to Lender that it is receiving
direct and indirect financial and other benefits as a result of this Guaranty;
represents to Lender that after giving effect to this Guaranty and the
contingent obligations evidenced hereby it is, and will be, solvent;
acknowledges that its liability hereunder shall be cumulative and in addition to
any other liability or obligation to Lender, whether the same is incurred
through the execution of a note, a similar guaranty, through endorsement, or
otherwise; and acknowledges that neither Lender nor any officer, employee,
agent, attorney or other representative of Lender has made any representation,
warranty or statement to Guarantor to induce it to execute this Guaranty.

      Guarantor hereby agrees that, except as hereinafter provided, its
obligations under this Guaranty shall be continuing, absolute and unconditional,
irrespective of (i) the validity or enforceability of the Obligations or of any
promissory note or other document evidencing all or any part of the Obligations,
(ii) the absence of any attempt to collect the Obligations from Borrower or any
other Obligated Party or other action to enforce the same, (iii) the waiver or
consent by Lender with respect to any provision of any instrument evidencing the
Obligations, or any part thereof, or any other agreement now or hereafter
executed by Borrower and delivered to Lender, (iv) failure by Lender to take any
steps to perfect and maintain its security interest in, or to preserve its
rights to, any security or collateral for the Obligations, (v) the surrender,
release, exchange, or alteration by Lender of any security or collateral for the
Obligations, (vi) Lender's election, in any proceeding instituted under Chapter
11 of Title 11 of the United States Code (11 U.S.C. (S)101 et seq.) (as amended,
the "Bankruptcy Code"), of the application of Section 1111(b)(2) of the
Bankruptcy Code, (vii) any borrowing or grant of a security interest by
Borrower, as debtor-in-possession, under Section 364 of the Bankruptcy Code,
(viii) the disallowance of all or any portion of Lender's claim(s) for repayment
of the Obligations under Section 502 of the Bankruptcy Code, or (ix) any other
circumstance which might otherwise constitute a legal or equitable discharge or
defense of a guarantor.

      No release, waiver, or discharge of Borrower or any other Obligated Party
from liability for payment of any of the Obligations, nor any renewal,
supplementation, modification, rearrangement or acceleration of any of the
Obligations, nor any amendment of any document evidencing any of the
Obligations, either express or implied, shall relieve Guarantor from liability
for payment of the full amount of the Obligations; and Guarantor will
immediately pay all Obligations to Lender or other person entitled thereto,
regardless of any defense, right of set-off or counterclaim which Borrower or
any other Obligated Party may have or assert, and regardless of whether Lender
or any other party shall have taken any steps to enforce any rights against
Borrower, any other Obligated Party, or any other party to collect such sum, and
regardless of any other condition or contingency, including, without limitation,
any neglect, delay or omission of Lender. Lender is hereby authorized, without
notice or demand and without affecting the liability of Guarantor, to, from time
to time: (i) accept partial payments on the Obligations; (ii) take and hold
security or collateral for the payment of this Guaranty or any other

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guarantees of the Obligations, and exchange, enforce, waive and release any such
security or collateral; and (iii) apply such security or collateral therefor in
any manner, without affecting or impairing the obligations of Guarantor
hereunder.

      Notwithstanding anything to the contrary contained herein, Guarantor shall
not have any right, claim or action, now or hereafter, against Borrower or any
other Obligated Party arising out of or in connection with this Guaranty or any
other document evidencing or securing the Obligations, including, without
limitation, any right or claim of subrogation, contribution, reimbursement,
exoneration, or indemnity, all such rights and claims being hereby expressly and
absolutely waived.

      Guarantor is familiar with, and has independently reviewed the financial
condition of, Borrower and hereby assumes responsibility for keeping itself
informed of the financial condition of Borrower, and any and all endorsers or
other guarantors of any instrument or document evidencing all or any part of the
Obligations and of all other circumstances bearing upon the risk of nonpayment
of the Obligations or any part thereof that diligent inquiry would reveal.
Guarantor hereby agrees that Lender shall have no duty to advise Guarantor of
information known to Lender regarding such condition or any such circumstances.
Guarantor is not relying on the financial condition of Borrower or the value of
any collateral for the Obligations as an inducement to enter into this Guaranty.
If Lender, in its sole discretion, undertakes at any time or from time to time
to provide any such information to Guarantor, Lender shall be under no
obligation (i) to undertake any investigation not a part of its regular business
routine, (ii) to disclose any information which, pursuant to accepted or
reasonable commercial finance practices, Lender wishes to maintain confidential,
or (iii) to make any other or future disclosures of such information or any
other information to Guarantor.

      Guarantor consents and agrees that Lender shall be under no obligation to
marshall any assets in favor of Guarantor or against or in payment of any or all
of the Obligations. Guarantor further agrees that, to the extent that Borrower
makes a payment or payments to Lender, or Lender receives any proceeds of
collateral, which payment or payments or any part thereof are subsequently
invalidated, declared to be fraudulent or preferential, set aside and/or
required to be repaid to Borrower, any of its estate, trustee, receiver or any
other party, including, without limitation, Guarantor, under any bankruptcy law,
state or federal law, common law or equitable cause, then to the extent of such
payment or repayment, the Obligations or part thereof which has been paid,
reduced or satisfied by such amount shall be reinstated and continued in full
force and effect as of the date such initial payment, reduction or satisfaction
occurred.

      Lender may, without notice to Guarantor or any other party, assign its
rights hereunder to any holder of the Obligations, in whole or in part, and upon
any such assignment all the terms and provisions of this Guaranty shall inure to
the benefit of such assignee, to the extent so assigned.

      Lender is relying and is entitled to rely upon each and all of the
provisions of this Guaranty; and, accordingly, if any provision of this Guaranty
should be held to be invalid or ineffective, then all other provisions shall
continue in full force and effect notwithstanding.

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      Any and all notices, requests and demands to or upon Guarantor to be
effective shall be in writing and shall be deemed to have been validly served,
given or delivered as follows: (a) if sent by certified or registered mail
return receipt requested, three business days after deposit in the mail, postage
prepaid, or, if earlier, when delivered against receipt; or (b) in the case of
telegraphic notice, when delivered to the telegraph company; or (c) in the case
of telex notice, when sent, answerback received; or (d) if sent by any other
method, upon actual delivery; in each case addressed to the address set forth
opposite Guarantor's signature below or at such other address as Guarantor shall
hereafter notify Lender.

      It is the intention of Borrower, Guarantor and Lender to conform strictly
to applicable usury laws. Accordingly, no agreements, conditions, provisions or
stipulations contained in this Guaranty or any other instrument, document or
agreement between Guarantor or Borrower and Lender or default of Guarantor or
Borrower, or the exercise by Lender of the right to accelerate the payment of
the maturity of principal and interest, or to exercise any option whatsoever
contained in this Guaranty or any other agreement between Guarantor or Borrower
and Lender, or the arising of any contingency whatsoever, shall entitle Lender
to collect, in any event, interest exceeding the maximum rate of interest
permitted by applicable state or federal law in effect from time to time
hereafter (the "Maximum Legal Rate") and in no event shall Guarantor be
obligated to pay interest exceeding such Maximum Legal Rate and all agreements,
conditions or stipulations, if any, which may in any event or contingency
whatsoever operate to bind, obligate or compel Guarantor to pay a rate of
interest exceeding the Maximum Legal Rate, shall be without binding force or
effect, at law or in equity, to the extent only of the excess of interest over
such Maximum Legal Rate. In the event any interest is charged in excess of the
Maximum Legal Rate ("Excess"), Guarantor acknowledges and stipulates that any
such charge shall be the result of an accident and bona fide error, and such
Excess shall be, first, applied to reduce the principal then unpaid hereunder;
second, applied to reduce the Obligations; and third, returned to Guarantor, it
being the intention of the parties hereto not to enter at any time into a
usurious or otherwise illegal relationship. Guarantor recognizes that, with
fluctuations in the applicable rate on the Obligations and the Maximum Legal
Rate, such an unintentional result could inadvertently occur. By the execution
of this Guaranty, Guarantor covenants that the credit or return of any Excess
shall constitute the acceptance by Guarantor of such Excess.

      If any sum due Lender by Guarantor hereunder is placed in the hands of an
attorney for collection, or is collected through probate, bankruptcy, or other
court proceeding, then Guarantor promises to pay Lender all costs, attorneys'
fees, and other expenses incurred by Lender pursuant to such collection efforts.

      Notwithstanding any other provision of this Guaranty, the Guarantor's
liability hereunder shall be limited to the lesser of the following amounts
minus, in either case, $1.00:

            a.    the lowest amount which would render this Guaranty a
      fraudulent transfer under Section 548 of the Bankruptcy Code; or

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            b.    if this Guaranty is subject to the Uniform Fraudulent Transfer
      Act (the "UFTA") or the Uniform Fraudulent Conveyance Act (the "UFCA") or
      any similar or analogous statute or rule of law, then the lowest amount
      which would render this Guaranty a fraudulent transfer or fraudulent
      conveyance under the UFTA, the UFCA, or any such similar or analogous
      statute or rule of law.

The amount of the limitation imposed upon the Guarantor's liability under the
terms of the preceding sentence shall be subject to redetermination as of each
date a "transfer" is deemed to have been made on account of this Guaranty under
applicable law. The Guarantor acknowledges that information concerning the
Guarantor's financial condition is under the control of the Guarantor and is
more readily available to the Guarantor than to Lender, and for that reason the
Guarantor agrees that should the Guarantor claim that the amount of its
liability under this Guaranty is less than the full amount of the Obligations
because of the provisions of this paragraph, then the burden of proving the
facts which would result in such limitation shall be upon the Guarantor.

      This Guaranty shall be terminated at such time as the Obligations are
satisfied in full.

      THIS GUARANTY HAS BEEN NEGOTIATED AND SHALL BE DEEMED TO HAVE BEEN MADE IN
THE STATE OF TEXAS. THIS GUARANTY SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF TEXAS AND NOT THE LAWS OF
CONFLICTS OF THE STATE OF TEXAS. AS PART OF THE CONSIDERATION FOR NEW VALUE AND
BENEFIT THIS DAY RECEIVED BY GUARANTOR, GUARANTOR HEREBY CONSENTS TO THE
JURISDICTION OF ANY STATE OR FEDERAL COURT LOCATED WITHIN DALLAS COUNTY OF THE
STATE OF TEXAS AND WAIVES PERSONAL SERVICE OF ANY AND ALL PROCESS UPON IT AND
CONSENTS THAT ALL SUCH SERVICE OF PROCESS BE MADE BY CERTIFIED OR REGISTERED
MAIL DIRECTED TO GUARANTOR AT THE ADDRESS STATED HEREIN AND SERVICE SO MADE
SHALL BE DEEMED TO BE COMPLETED UPON ACTUAL RECEIPT THEREOF. GUARANTOR WAIVES
ANY OBJECTION TO JURISDICTION AND VENUE OF ANY ACTION INSTITUTED AGAINST IT AS
PROVIDED HEREIN AND AGREES NOT TO ASSERT ANY DEFENSE BASED ON LACK OF
JURISDICTION OR VENUE.

      EXCEPT AS OTHERWISE PROVIDED FOR IN THIS GUARANTY, GUARANTOR WAIVES THE
RIGHT TO TRIAL BY JURY (WHICH LENDER HEREBY ALSO WAIVES) IN ANY ACTION, SUIT,
PROCEEDING OR COUNTERCLAIM OF ANY KIND ARISING OUT OF OR RELATED TO THIS
GUARANTY OR THE OBLIGATIONS.

      THIS WRITTEN GUARANTY, TOGETHER WITH ALL OTHER INSTRUMENTS, AGREEMENTS AND
CERTIFICATES EXECUTED BY THE PARTIES IN CONNECTION WITH THE OBLIGATIONS OR WITH
REFERENCE HERETO OR THERETO, REPRESENT THE FINAL AGREEMENT BETWEEN THE

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PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES.

            Executed and delivered as of October 16, 1995

                                        SEA ELECTRONICS, INC.

                                        By: /s/ Steven L. Schneider
                                            ----------------------------------
                                            Steven L. Schneider, President

                                        Address:

                                        12000 E. Skelly Drive
                                        Tulsa, Oklahoma 74128

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                                                                   EXHIBIT 10.19

WHEN RECORDED, RETURN TO:

Hughes & Luce, L.L.P.
1717 Main Street, Suite 2800
Dallas, Texas  75201
Attn: Larry A. Makel, Esq.

A POWER OF SALE HAS BEEN GRANTED IN THE MORTGAGE (AS HEREIN DEFINED) RELATED TO
THIS AMENDMENT (AS HEREIN DEFINED). A POWER OF SALE MAY ALLOW THE TRUSTEE OR THE
BENEFICIARY TO TAKE THE MORTGAGED PROPERTY AND SELL IT WITHOUT GOING TO COURT IN
A FORECLOSURE ACTION UPON DEFAULT BY THE GRANTOR UNDER THE MORTGAGE.

                FIRST AMENDMENT TO MORTGAGE, SECURITY AGREEMENT,
                   FINANCING STATEMENT AND ASSIGNMENT OF RENTS
                                   [OKLAHOMA]

STATE OF OKLAHOMA   (S)
                    (S) KNOW ALL MEN BY THESE PRESENTS: COUNTY OF TULSA    (S)

      THIS FIRST AMENDMENT TO MORTGAGE, SECURITY AGREEMENT, FINANCING STATEMENT
AND ASSIGNMENT OF RENTS (this "Amendment") is executed on October ___, 1995, to
be effective as of October 16, 1995, by LOWRANCE ELECTRONICS, INC., a Delaware
corporation ("Grantor"), with its principal place of business at 12000 East
Skelly Drive, Tulsa, Oklahoma 74128 for the benefit of SHAWMUT CAPITAL
CORPORATION, a Connecticut corporation, ("Beneficiary"), successor by assignment
to Barclays Business Credit, Inc., with offices at 2711 Haskell Avenue, Suite
2100, LB 21, Dallas, Texas 75204.

                                    RECITALS

      A.    Grantor previously executed that certain Mortgage, Security
Agreement, Financing Statement and Assignment of Rents dated December 15, 1993
and recorded at Book 5575, Page 1068 of the real property records of Tulsa
County, Oklahoma (as heretofore amended, the "Mortgage"), pursuant to which
Grantor granted to Beneficiary various liens and security interests on, among
other things, the real property described on Exhibit A attached hereto and
incorporated herein by reference, and all attachments, fixtures and other
property located thereon or related thereto (collectively, the "Property"). Such
liens secured repayment of the indebtedness owing from Grantor, Lowrance
Contracts, Inc. ("Lowrance Contracts"), LEI Extras, Inc. ("LEI") and Lowrance
Australia Pty Limited ("Lowrance Australia") (Grantor, Lowrance Contracts, LEI
and Lowrance Australia are individually and collectively referred to

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herein as "Original Borrowers") to Beneficiary, including, but not limited to,
the indebtedness incurred pursuant to that certain Loan and Security Agreement
dated December 15, 1993, executed by Original Borrowers and Beneficiary (the
"Original Loan Agreement") (the "Secured Indebtedness").

      B.    Original Borrowers and Beneficiary desire to (i) amend the Original
Loan Agreement pursuant to the terms and conditions of that certain First
Amendment to Loan and Security Agreement dated as of the date hereof by and
among Original Borrowers, Sea Electronics, Inc. ("Sea Electronics") (Original
Borrowers and Sea Electronics are individually and collectively referred to
herein as "Borrowers") and Grantor (the "First Amendment") (the Original Loan
Agreement, as amended by the First Amendment, and as otherwise amended, modified
and revised from time to time is herein, the "Loan Agreement") (the Loan
Agreement and all contracts, instruments, documents and agreements related
thereto and/or executed in connection therewith are collectively referred to
herein as the "Loan Documents") to (a) re-advance to Borrower a portion of the
Term Loan that was previously repaid to Beneficiary and (b) include Sea
Electronics as a borrower under the Loan Agreement, and (ii) preserve, maintain
and carry forward all of the liens and security interests previously granted to
Beneficiary in the Mortgage and the other contracts, instruments, documents and
agreements executed in connection therewith, such that such liens and security
interests will apply to all indebtedness incurred by Grantor under the First
Amendment.

      NOW, THEREFORE, in consideration of the premises herein contained and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties, intending to be legally bound, agree as
follows:

                                    ARTICLE I
                                   DEFINITIONS

      1.01 Unless otherwise defined herein, capitalized terms shall have the
meaning ascribed to them in the Mortgage.

                                   ARTICLE II
                                   AMENDMENTS

      2.01 AMENDMENT TO DEFINITIONS. Section 1.1 of the Mortgage is hereby
amended by deleting the definitions of "Loan Agreement" and "Term Note"
therefrom and substituting the following definitions therefor, as applicable:

            "`Loan Agreement' means the Loan and Security Agreement among
      Grantor, LEI Extras, Inc., Lowrance Contracts, Inc., Lowrance
      Australia Pty Limited and Beneficiary dated December 15, 1993, as
      the same has been amended by the First Amendment Agreement and as
      otherwise renewed, extended, amended, modified and restated from
      time to time."

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            "`Term Note' means that certain Amended and Restated Secured
      Promissory Note dated as of October 16, 1995, in the original
      principal amount of $3,500,000, executed by Borrower and payable to
      the order of Beneficiary, any and all renewals, modifications,
      increases and extensions of such note, and any and all notes
      executed in substitution for such note."

      2.02 INCLUSION OF DEFINITIONS. Section 1.1 of the Mortgage is hereby
amended by inserting the following definitions therein in alphabetical order:

      "First Amendment Agreement means that certain First Amendment to Loan and
      Security Agreement dated as of October 16, 1995, by and between
      Beneficiary and Borrower."

      "`Revolving Credit Loans' is defined in the Loan Agreement."

                                   ARTICLE III
                                    NO WAIVER

      3.01 Except as otherwise specifically provided for in this Amendment,
nothing contained herein shall be construed as a waiver by Beneficiary of any
covenant or provision of the Mortgage, the Loan Agreement, this Amendment, or of
any other contract or instrument between Grantor and Beneficiary, and
Beneficiary's failure at any time or times hereafter to require strict
performance by Grantor of any provision thereof shall not waive, affect or
diminish any right of Beneficiary to thereafter demand strict compliance
therewith. Beneficiary hereby reserves all rights granted under the Loan
Agreement, the other Loan Documents, this Amendment and any other contract or
instrument between Grantor and Beneficiary.

                                  ARTICLE IV
                 RATIFICATIONS, REPRESENTATIONS AND WARRANTIES

      4.01 RATIFICATIONS. The terms and provisions set forth in this Amendment
shall modify and supersede all inconsistent terms and provisions set forth in
the Mortgage, the Loan Agreement and the other Loan Documents, and, except as
expressly modified and superseded by this Amendment, the terms and provisions of
the Mortgage, the Loan Agreement and the other Loan Documents are ratified and
confirmed and shall continue in full force and effect. Grantor and Beneficiary
agree that the Mortgage, as amended hereby, the Loan Agreement and the other
Loan Documents shall continue to be legal, valid, binding and enforceable in
accordance with their respective terms.

      4.02 REPRESENTATIONS AND WARRANTIES. Grantor hereby represents and
warrants to Beneficiary that (a) the execution, delivery and performance of this
Amendment and any and all other Loan Documents executed and/or delivered in
connection herewith have been authorized by all requisite corporate action on
the part of Grantor and will not violate the Certificate of Incorporation or
Bylaws of Grantor; (b) the representations and warranties contained in the
Mortgage, as amended hereby, the Loan Agreement and any other Loan Document are
true and

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correct on and as of the date hereof and on and as of the date of execution
hereof as though made on and as of each such date; (c) no Default or Event of
Default under the Mortgage, as amended hereby, the Loan Agreement or any other
Loan Document has occurred and is continuing, unless such Default or Event or
Default has been specifically waived in writing by Beneficiary; and (d) Grantor
is in full compliance with all covenants and agreements contained in the
Mortgage, as amended hereby, the Loan Agreement and the other Loan Documents, as
amended hereby.

                                    ARTICLE V
                            MISCELLANEOUS PROVISIONS

      5.01 SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All representations and
warranties made in the Mortgage, the Loan Agreement or any other Loan Document,
including, without limitation, any document furnished in connection with this
Amendment, shall survive the payment in full of the Secured Indebtedness and the
termination of Lender's obligation to make Revolving Credit Loans (as defined in
the Loan Agreement) under the Loan Agreement for a period of four (4) years
beyond the date of such payment in full and termination, and no investigation by
Beneficiary or any closing shall affect the representations and warranties or
the right of Beneficiary to rely upon them.

      5.02 REFERENCE TO LOAN AGREEMENT. Each of the Mortgage, the Loan Agreement
and the other Loan Documents, and any and all other agreements, documents or
instruments now or hereafter executed and delivered pursuant to the terms hereof
or pursuant to the terms of the Mortgage, as amended hereby, the Loan Agreement
or any other Loan Document are hereby amended so that any reference in the
Mortgage, the Loan Agreement or the other Loan Documents to the Mortgage shall
mean a reference to the Mortgage as amended hereby.

      5.03 EXPENSES OF BENEFICIARY. As provided in the Loan Agreement, Grantor
agrees to pay on demand all costs and expenses incurred by Beneficiary in
connection with the preparation, negotiation and execution of this Amendment and
the other Loan Documents to be executed in connection herewith and any and all
amendments, modifications, and supplements thereto, including, without
limitation, the costs and fees of Beneficiary's legal counsel, and all costs and
expenses incurred by Beneficiary in connection with the enforcement or
preservation of any rights under the Loan Agreement, as amended hereby, or any
other Loan Document, including, without limitation, the costs and fees of
Beneficiary's legal counsel.

      5.04 SEVERABILITY. Any provision of this Amendment held by a court of
competent jurisdiction to be invalid or unenforceable shall not impair or
invalidate the remainder of this Amendment and the effect thereof shall be
confined to the provision so held to be invalid or unenforceable.

      5.05 SUCCESSORS AND ASSIGNS. This Amendment is binding upon and shall
inure to the benefit of Beneficiary and Grantor and their respective successors
and assigns, except Grantor may not assign or transfer any of its rights or
obligations hereunder without the prior written consent of Beneficiary.

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      5.06 COUNTERPARTS. This Amendment may be executed in one or more
counterparts, each of which when so executed shall be deemed to be an original,
but all of which when taken together shall constitute one and the same
instrument.

      5.07 EFFECT OF WAIVER. No consent or waiver, express or implied, by
Beneficiary to or for any breach of or deviation from any covenant or condition
by Grantor shall be deemed a consent to or waiver of any other breach of the
same or any other covenant, condition or duty.

      5.08 HEADINGS. The headings, captions, and arrangements used in this
Amendment are for convenience only and shall not affect the interpretation of
this Amendment.

      5.09 GOVERNING LAWS. THE SECURED INDEBTEDNESS HAS BEEN CREATED PURSUANT TO
THE LOAN AGREEMENT WHICH WAS EXECUTED AND DELIVERED IN THE STATE OF TEXAS; IT
BEING THE EXPRESS INTENT AND AGREEMENT OF GRANTOR AND BENEFICIARY THAT THE
SECURED INDEBTEDNESS BE CONSTRUED AND GOVERNED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF TEXAS. NOTWITHSTANDING SUCH INTENTION AND AGREEMENT THAT THE LAWS
OF THE STATE OF TEXAS SHALL GOVERN THE SECURED INDEBTEDNESS, GRANTOR AND THE
BENEFICIARY EXPRESSLY COVENANT AND AGREE THAT THE LAWS OF THE STATE WHERE ANY
PORTION OF THE MORTGAGED PROPERTY IS LOCATED SHALL APPLY TO ENFORCEMENT OF THE
POWER OF SALE AND THE OTHER RIGHTS AND REMEDIES CREATED THE MORTGAGE WHICH ARE
GIVEN AGAINST SUCH PART OF THE MORTGAGED PROPERTY WHICH CONSISTS OF REAL
PROPERTY LOCATED WITHIN SUCH STATE, AND THAT THE UNIFORM COMMERCIAL CODE SHALL
APPLY TO THE RIGHTS AND REMEDIES CREATED THE MORTGAGE WHICH ARE GIVEN AGAINST
SUCH PART OF THE MORTGAGED PROPERTY WHICH CONSISTS OF PERSONAL PROPERTY. THE
SUBSTANTIVE LAWS OF THE STATE OF TEXAS SHALL GOVERN THE VALIDITY, CONSTRUCTION,
ENFORCEMENT, AND INTERPRETATION OF THIS AMENDMENT, AND THE OTHER LOAN DOCUMENTS,
UNLESS OTHERWISE SPECIFIED THEREIN.

      5.10 FINAL AGREEMENT. THE MORTGAGE, AS AMENDED HEREBY, THE LOAN AGREEMENT
AND THE OTHER LOAN DOCUMENTS REPRESENT THE ENTIRE EXPRESSION OF THE PARTIES WITH
RESPECT TO THE SUBJECT MATTER HEREOF ON THE DATE THIS AMENDMENT IS EXECUTED. THE
MORTGAGE, AS AMENDED HEREBY, THE LOAN AGREEMENT AND THE OTHER LOAN DOCUMENTS MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES. NO MODIFICATION, RESCISSION, WAIVER, RELEASE OR AMENDMENT OF ANY
PROVISION OF THIS AMENDMENT SHALL BE MADE, EXCEPT BY A WRITTEN AGREEMENT SIGNED
BY GRANTOR AND BENEFICIARY.

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      5.11 RELEASE. GRANTOR HEREBY ACKNOWLEDGES THAT IT HAS NO DEFENSE,
COUNTERCLAIM, OFFSET, CROSS-COMPLAINT, CLAIM OR DEMAND OF ANY KIND OR NATURE
WHATSOEVER THAT CAN BE ASSERTED TO REDUCE OR ELIMINATE ALL OR ANY PART OF ITS
LIABILITY TO REPAY THE "SECURED INDEBTEDNESS" OR TO SEEK AFFIRMATIVE RELIEF OR
DAMAGES OF ANY KIND OR NATURE FROM BENEFICIARY. GRANTOR HEREBY VOLUNTARILY AND
KNOWINGLY RELEASES AND FOREVER DISCHARGES BENEFICIARY, ITS PREDECESSORS, AGENTS,
EMPLOYEES, SUCCESSORS AND ASSIGNS, FROM ALL POSSIBLE CLAIMS, DEMANDS, ACTIONS,
CAUSES OF ACTION, DAMAGES, COSTS, EXPENSES, AND LIABILITIES WHATSOEVER, KNOWN OR
UNKNOWN, ANTICIPATED OR UNANTICIPATED, SUSPECTED OR UNSUSPECTED, FIXED,
CONTINGENT, OR CONDITIONAL, AT LAW OR IN EQUITY, ORIGINATING IN WHOLE OR IN PART
ON OR BEFORE THE DATE THIS AMENDMENT IS EXECUTED, WHICH THE GRANTOR MAY NOW OR
HEREAFTER HAVE AGAINST BENEFICIARY, ITS PREDECESSORS, AGENTS, EMPLOYEES,
SUCCESSORS AND ASSIGNS, IF ANY, AND IRRESPECTIVE OF WHETHER ANY SUCH CLAIMS
ARISE OUT OF CONTRACT, TORT, VIOLATION OF LAW OR REGULATIONS, OR OTHERWISE, AND
ARISING FROM ANY "LOANS", INCLUDING, WITHOUT LIMITATION, ANY CONTRACTING FOR,
CHARGING, TAKING, RESERVING, COLLECTING OR RECEIVING INTEREST IN EXCESS OF THE
HIGHEST LAWFUL RATE APPLICABLE, THE EXERCISE OF ANY RIGHTS AND REMEDIES UNDER
THE LOAN AGREEMENT OR THE OTHER LOAN DOCUMENTS, AND NEGOTIATION FOR AND
EXECUTION OF THIS AMENDMENT.

      Executed and effective as of the dates indicated above.

                                       GRANTOR:

                                       LOWRANCE ELECTRONICS, INC.

                                       By: /s/ Darrell J. Lowrance
                                           ---------------------------------
                                           Darrell J. Lowrance, President

                                       SHAWMUT CAPITAL CORPORATION

                                       By: /s/ Hance VanBeber
                                           ---------------------------------
                                           Hance VanBeber, Vice President

EXHIBIT:

A - Property Description

                                        6

<PAGE>

THE STATE OF OKLAHOMA         (S)
                              (S)
COUNTY OF TULSA               (S)

      This instrument was acknowledged before me on October ___, 1995, by
Darrell J. Lowrance, the President of Lowrance Electronics, Inc., a Delaware
corporation, on behalf of said corporation.

                                       /s/ Janice E. Dorsey
                                       ---------------------------------
                                       Notary Public in and for said
                                       County and State

                                       JANICE E. DORSEY
                                       ---------------------------------
                                       Notary's Printed Name

My Commission Expires:
Sept. 5, 1999

THE STATE OF TEXAS            (S)
                              (S)
COUNTY OF DALLAS              (S)

      This instrument was acknowledged before me on October 13 , 1995, by Hance
VanBeber, Vice President of Shawmut Capital Corporation, a Connecticut
corporation, on behalf of said corporation.

                                       /s/ Celia Wood
                                       ---------------------------------
                                       Notary Public in and for said
                                       County and State

                                       CELIA WOOD
                                       Notary's Printed Name

My Commission Expires:
5/8/97

                                        7

<PAGE>

                                   EXHIBIT A

                             PROPERTY DESCRIPTION

                                (See attached)

                                      A-1

<PAGE>

TRACT 1:

THE WEST HALF (W/2) OF LOT THIRTY-FIVE (35), PLAINVIEW HEIGHTS ADDITION, AN
ADDITION TO THE CITY OF TULSA, TULSA COUNTY, STATE OF OKLAHOMA, ACCORDING TO THE
RECORDED PLAT THEREOF.

TRACT 2:

THE NORTH EIGHTY (80) FEET OF THE EAST HALF (E/2) OF LOT THIRTY-FIVE (35),
PLAINVIEW HEIGHTS ADDITION, AN ADDITION TO THE CITY OF TULSA, TULSA COUNTY,
STATE OF OKLAHOMA, ACCORDING TO THE RECORDED PLAT THEREOF.

TRACT 3:

THE SOUTH EIGHTY AND ONE HALF (80.5) FEET OF THE EAST HALF (E/2) OF LOT
THIRTY-FIVE (35), PLAINVIEW HEIGHTS ADDITION, AN ADDITION TO THE CITY OF TULSA,
TULSA COUNTY, STATE OF OKLAHOMA, ACCORDING TO THE RECORDED PLAT THEREOF.

TRACT 4:

ALL OF LOT THIRTY-SIX (36) AND THE WEST 489.0 FEET OF LOT THIRTY-SEVEN (37),
PLAINVIEW HEIGHTS ADDITION, AN ADDITION TO THE CITY OF TULSA, TULSA COUNTY,
STATE OF OKLAHOMA, ACCORDING TO THE RECORDED PLAT THEREOF.

TRACT 5:

THE EAST ONE HUNDRED FIFTY (150) FEET OF LOT THIRTY-SEVEN (37), PLAINVIEW
HEIGHTS ADDITION, AN ADDITION TO THE CITY OF TULSA, TULSA COUNTY, STATE OF
OKLAHOMA, ACCORDING TO THE RECORDED PLAT THEREOF.

TRACT 6:

THE NORTH SIXTY-FIVE (65) FEET OF THE WEST ONE HUNDRED FIFTY-FIVE (155) FEET OF
THE EAST ONE HUNDRED SIXTY (160) FEET OF LOT THIRTY-EIGHT (38), IN PLAINVIEW
HEIGHTS ADDITION, AN ADDITION TO THE CITY OF TULSA, TULSA COUNTY, STATE OF
OKLAHOMA, ACCORDING TO THE RECORDED PLAT THEREOF.

TRACT 7:

THE WEST 139.5 FEET OF THE EAST 299.5 FEET OF THE SOUTH HALF (S/2) OF LOT
THIRTY-NINE (39) AND THE WEST 139.5 FEET OF THE EAST 299.5 FEET OF THE NORTH
140.5 FEET OF LOT THIRTY-EIGHT (38), IN PLAINVIEW HEIGHTS ADDITION, AN ADDITION
TO THE CITY OF TULSA, TULSA COUNTY, STATE OF OKLAHOMA, ACCORDING TO THE RECORDED
PLAT THEREOF.

TRACT 8:

THE EAST ONE HUNDRED SIXTY (160) FEET OF THE SOUTH HALF (S/2) OF LOT THIRTY-NINE
(39), PLAINVIEW HEIGHTS ADDITION, AN ADDITION TO THE CITY OF TULSA, TULSA
COUNTY, STATE OF OKLAHOMA, ACCORDING TO THE RECORDED PLAT THEREOF.

<PAGE>

TRACT 9:

THE WEST HALF (W/2) OF THE NORTH HALF (N/2) OF LOT THIRTY-NINE (39). PLAINVIEW
HEIGHTS ADDITION, AN ADDITION TO THE CITY OF TULSA, TULSA COUNTY, STATE OF
OKLAHOMA, ACCORDING TO THE RECORDED PLAT THEREOF.

TRACT 10:

LOT THREE (3), BLOCK ONE (1), LESS THE SOUTH FIFTY (50) FEET THEREOF, AND LESS A
STRIP, PIECE OR PARCEL OF LAND LYING IN PART OF LOT 3, BLOCK 1, LOWRANCE SQUARE
ADDITION TO THE CITY OF TULSA IN TULSA COUNTY, OKLAHOMA. SAID PARCEL OF LAND
BEING DESCRIBED BY METES AND BOUNDS AS FOLLOWS: BEGINNING AT A POINT ON THE
PRESENT EASTERLY RIGHT-OF-WAY LINE OF INTERSTATE HIGHWAY NO. 44, A DISTANCE OF
142.42 FEET NORTHEASTERLY OF THE POINT WHERE SAID RIGHT-OF-WAY LINE INTERSECTS
THE SOUTH LINE OF SAID LOT 3, THENCE NORTHEASTERLY ALONG SAID RIGHT-OF-WAY LINE
OF SAID LOT 3 A DISTANCE OF 100.00 FEET, THENCE S 41 DEGREES 30' 16" W A
DISTANCE OF 99.42 FEET TO POINT OF BEGINNING. ALSO: BEGINNING AT A POINT ON THE
PRESENT EASTERLY RIGHT-OF-WAY LINE OF INTERSTATE HIGHWAY NO. 44 AND THE WEST
LINE OF SAID LOT 3, A DISTANCE OF 432.87 FEET EAST OF AND 449.92 FEET NORTH OF
THE SW CORNER OF SAID LOT 3, THENCE NORTHEASTERLY ALONG SAID RIGHT-OF-WAY AND
LOT LINE A DISTANCE OF 15.00 FEET TO A JOG IN SAID RIGHT-OF-WAY AND LOT LINE,
THENCE SOUTHEASTERLY ALONG SAID JOG A DISTANCE OF 40.00 FEET, THENCE S 47
DEGREES 39' 49" W A DISTANCE OF 15.00 FEET, THENCE N 42 DEGREES 20' 11" W A
DISTANCE OF 40.00 FEET TO A POINT OF BEGINNING, CONTAINING IN BOTH PARCELS 0.02
ACRES, MORE OR LESS, LOWRANCE SQUARE, A RESUBDIVISION OF MORGAN SQUARE AND PART
OF THE SE/4 OF THE SW/4 OF SECTION 5, T-19-N, R-14-E, TULSA COUNTY, STATE OF
OKLAHOMA, ACCORDING TO THE RECORDED PLAT NO. 3031.

TRACT 11:

LOT ONE (1), BLOCK ONE (1), ELEVEN TRADE CENTER, AN ADDITION TO THE CITY OF
TULSA, TULSA COUNTY, STATE OF OKLAHOMA, ACCORDING TO THE RECORDED PLAT THEREOF.

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