<PAGE>

                                                                   EXHIBIT 10.14

                              AMENDED AND RESTATED
                             SECURED PROMISSORY NOTE

$3,500,000                                                      October 16, 1995

      FOR VALUE RECEIVED, the undersigned (together, "Borrower") hereby jointly
and severally promise to pay to the order of Shawmut Capital Corporation,
successor in interest by assignment to Barclays Business Credit, Inc.
("Lender"), in such coin or currency of the United States which shall be legal
tender in payment of all debts and dues, public and private, at the time of
payment, the principal sum of THREE MILLION FIVE HUNDRED THOUSAND AND NO/100
DOLLARS ($3,500,000), together with interest from and after the date hereof at
the annual rate set forth below.

      This Secured Promissory Note (this "Note") is the Term Note referred to
in, and is issued pursuant to, that certain Loan and Security Agreement between
Borrower and Lender dated as of December 15, 1993 (as amended from time to time,
the "Loan Agreement"), and is entitled to all of the benefits and security of
the Loan Agreement. All of the terms, covenants and conditions of the Loan
Agreement and all other instruments evidencing or securing the indebtedness
hereunder (including, without limitation, the "Security Documents" as defined in
the Loan Agreement) are hereby made a part of this Note and are deemed
incorporated herein in full. All capitalized terms used herein, unless otherwise
specifically defined in this Note, shall have the meanings ascribed to them in
the Loan Agreement.

      Subject to Sections 3.1(C) and 3.1(D) of the Loan Agreement, the principal
balance of this Note shall bear interest at the rate per annum for the Term Loan
stated in Section 3.1(A) of the Loan Agreement, except that upon and after the
occurrence and during the continuance of an Event of Default, the principal
balance of this Note and, to the extent permitted by applicable law, past-due
interest, shall bear interest at the Default Rate. Interest on this Note shall
be calculated in the manner provided in the Loan Agreement.

      The principal amount and accrued interest of this Note shall be due and
payable on the dates and in the manner hereinafter set forth:

            (a)   interest shall be due and payable monthly, in arrears,
      on the first day of each month, commencing on the first day of the
      first month after the date of this Note, and continuing until such
      time as the full principal balance, together with all other amounts
      owing hereunder, shall have been paid in full;

            (b)   principal shall be due and payable as follows:

                  (i)   on the first day of each month, commencing on the
      first day of the first month after the date of this Note, in monthly
      installments of $23,167.00 each;

                  (ii)  on May 31, 1996 and May 31, 1997, in installments
      of $500,000.00 each; and

                                       1

<PAGE>

                  (iii) with all remaining principal being due and payable
      in full on the last day of the Original Term (or the last day of the
      Renewal Term if the Loan Agreement is extended as provided in
      Section 3.2 thereof), or on any earlier termination of the Loan
      Agreement by Borrower pursuant to Section 3.3 thereof.

      This Note shall be subject to mandatory prepayment in accordance with the
provisions of Section 2.2(C) of the Loan Agreement. Borrower may prepay this
Note in whole or in part at any time without premium or penalty, unless
otherwise specified in the Loan Agreement. All partial prepayments, whether
mandatory or voluntary, shall be applied to installments of principal in the
inverse order of their maturities.

      Upon and after the occurrence of an Event of Default, Lender shall have
all of the rights and remedies set forth in Section 11 of the Loan Agreement,
including the right to declare the then outstanding principal balance hereof and
all accrued interest hereon to be and the same shall thereupon become,
immediately due and payable without notice to or demand upon Borrower, all of
which Borrower hereby expressly waives.

      If this Note is collected by or through an attorney at law, then Borrower
shall be obligated to pay, in addition the principal balance and accrued
interest hereof, reasonable attorney's fees and court costs, in addition to any
other charges for which Borrower is responsible under the Loan Agreement and
other Loan Documents.

      Time is of the essence of this Note. To the fullest extent permitted by
applicable law, Borrower, for itself and its legal representatives, successors
and assigns, expressly waives, presentment, demand, protest, notice of dishonor,
notice of non-payment, notice of maturity, notice of protest, presentment for
the purpose of accelerating maturity, diligence in collection, and the benefit
of any exemption or insolvency laws.

      Wherever possible each provision of this Note shall be interpreted in such
a manner as to be effective and valid under applicable law, but if any provision
of this Note shall be prohibited or invalid under applicable law, such provision
shall be ineffective to the extent of such prohibition or invalidity without
invalidating the remainder of such provision or remaining provisions of this
Note. No delay or failure on the part of Lender in the exercise of any right or
remedy hereunder shall operate as a waiver thereof, nor as an acquiescence in
any default, nor shall any single or partial exercise by Lender of any right or
remedy preclude any other right or remedy. Lender, at its option, may enforce
its rights against any collateral securing this Note without enforcing its
rights against Borrower, any guarantor of the indebtedness evidenced hereby or
any other property or indebtedness due or to become due to Borrower. Borrower
agrees that, without releasing or impairing Borrower's liability hereunder,
Lender may at any time release, surrender, substitute or exchange any collateral
securing this Note and may at any time release any party primarily or
secondarily liable for the indebtedness evidenced by this Note.

                                       2

<PAGE>

      Regardless of any provision contained in this Note or any of the other
Loan Documents, in no contingency or event whatsoever shall the aggregate of all
amounts that are contracted for, charged or received by Lender pursuant to the
terms of this Note or any of the other Loan Documents and that are deemed
interest under applicable law exceed the highest rate permissible under any
applicable law. No agreements, conditions, provisions or stipulations contained
in this Note or any of the other Loan Documents or the exercise by Lender of the
right to accelerate the payment or the maturity of all or any portion of the
Obligations, or the prepayment by Borrower of any of the Obligations or the
occurrence of any contingency whatsoever, shall entitle Lender to charge or
receive in any event, interest or any charges, amounts, premiums or fees deemed
interest by applicable law (such interest, charges, amounts, premiums and fees
referred to herein collectively as "Interest") in excess of the Maximum Rate and
in no event shall Borrower be obligated to pay Interest exceeding such Maximum
Rate, and all agreements, conditions or stipulations, if any, which may in any
event or contingency whatsoever operate to bind, obligate or compel Borrower to
pay Interest exceeding the Maximum 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 Rate. If any Interest is charged or received in excess of the
Maximum Rate ("Excess"), Borrower acknowledges and stipulates that any such
charge or receipt shall be the result of an accident and bona fide error, and
such Excess, to the extent received, shall be applied first to reduce the
principal Obligations and the balance, if any, returned to Borrower, it being
the intent of the parties hereto not to enter into a usurious or otherwise
illegal relationship. The right to accelerate the maturity of any of the
Obligations does not include the right to accelerate any interest that has not
otherwise accrued on the date of such acceleration, and Lender does not intend
to collect any unearned interest in the event of any such acceleration. Borrower
recognizes that, with fluctuations in the rates of interest set forth in the
Agreement and this Note and the Maximum Rate, such an unintentional result could
inadvertently occur. All monies paid to Lender hereunder or under any of the
other Loan Documents, whether at maturity or by prepayment, shall be subject to
any rebate of unearned interest as and to the extent required by applicable law.
By the execution of this Note, Borrower covenants that (i) the credit or return
of any Excess shall constitute the acceptance by Borrower of such Excess, and
(ii) Borrower shall not seek or pursue any other remedy, legal or equitable,
against Lender, based in whole or in part upon contracting for, charging or
receiving any Interest in excess of the Maximum Rate. For the purpose of
determining whether or not any Excess has been contracted for, charged or
received by Lender, all interest at any time contracted for, charged or received
from Borrower in connection with any of the Loan Documents shall, to the extent
permitted by applicable law, be amortized, prorated, allocated and spread among
all Loans throughout the full term of the Obligations. Borrower and Lender
shall, to the maximum extent permitted under applicable law, (i) characterize
any non-principal payment as an expense, fee or premium rather than as Interest
and (ii) exclude voluntary prepayments and the effects thereof. The provisions
of this paragraph shall be deemed to be incorporated into every Loan Document.
All such Loan Documents and communications relating to any Interest owed by
Borrower and all figures set forth therein shall, for the sole purpose of
computing the extent of Obligations, be automatically recomputed by Borrower,
and by any court considering the same, to give effect to the adjustments or
credits required by this paragraph. If, in any month, the effective rate of
interest hereunder, would have exceeded the Maximum Rate, then the effective
interest rate for that month shall be the Maximum Rate, and, if in future months
the effective interest rate would be otherwise be less than the Maximum Rate,

                                       3

<PAGE>

then the effective interest rate shall remain at the Maximum Rate until such
time as the amount of interest paid hereunder equal the amount of interest which
would have been paid if the same had not been limited by the Maximum Rate.

      THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED AND ENFORCED IN ACCORDANCE
WITH, THE INTERNAL LAWS OF THE STATE OF TEXAS.

      This Note is given in increase, amendment, modification, renewal and
extension, but not in extinguishment or novation, of that certain Secured
Promissory Note dated December 15, 1993 in the original principal amount of
$3,500,000, executed by Borrower and payable to the order of Lender.

      IN WITNESS WHEREOF, Borrower has caused this Note to be duly executed and
delivered in Dallas, Texas on the date first above written.

                                        LOWRANCE ELECTRONICS, INC.

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

                                        LEI EXTRAS, INC.

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

                                        LOWRANCE CONTRACTS, INC.

                                        By: /s/ Terry R. Nimmo
                                            ----------------------------------
                                            Terry R. Nimmo, Vice President

                                       4

<PAGE>

                                        The Common Seal of
                                        LOWRANCE AUSTRALIA PTY LIMITED
                                        was affixed in accordance with its
                                        Articles of Association in the
                                        presence of:

                                        By: /s/ Darrel J. Lowrance
                                            ----------------------------------
                                            Darrell J. Lowrance, Director

     [SEAL]

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

                                        SEA ELECTRONICS, INC.

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

                                       5