Document:

<PAGE>

                                                                   EXHIBIT 10.28

                               EIGHTH AMENDMENT TO
                           LOAN AND SECURITY AGREEMENT

    THIS EIGHTH AMENDMENT TO LOAN AND SECURITY AGREEMENT (the "Amendment") is
made and entered into as of the 9th day of December, 1997, to be effective
(unless otherwise specified herein) as of December 9, 1997 (the "Effective
Date"), by and among FLEET CAPITAL CORPORATION, a Rhode Island corporation,
successor in interest by merger to FLEET CAPITAL CORPORATION, a Connecticut
corporation, formerly known as SHAWMUT CAPITAL CORPORATION, successor in
interest by assignment to BARCLAYS BUSINESS CREDIT, INC. ("Lender"), LOWRANCE
ELECTRONICS, INC., a Delaware corporation ("Lowrance"), LEI EXTRAS, INC., a
Delaware corporation ("LEI"), LOWRANCE CONTRACTS, INC., a Delaware corporation
("Lowrance Contracts"), and SEA ELECTRONICS, INC., an Oklahoma corporation ("Sea
Electronics") (Lowrance, LEI, Lowrance Contracts and Sea Electronics are herein
individually and collectively called "Borrower").

                                    RECITALS

     A. Borrower, Lowrance Australia Pty Limited ("Lowrance Australia") and
Lender have entered into that certain Loan and Security Agreement, dated
December 15, 1993, as amended by (i) that certain First Amendment to Loan and
Security Agreement, dated October 16, 1995, by and among Lender, Borrower and
Lowrance Australia, (ii) that certain Second Amendment to Loan and Security
Agreement, dated November 1, 1996 by and among Lender and Borrower, (iii) that
certain Third Amendment to Loan and Security Agreement, dated December 30, 1996,
by and among Lender and Borrower, (iv) that certain Fourth Amendment to Loan and
Security Agreement, entered into effective as of April 1, 1997, by and among
Lender and Borrower, (v) that certain Fifth Amendment to Loan and Security
Agreement, entered into effective as of August 25, 1997, by and between Lender
and Borrower, (vi) that certain Sixth Amendment to Loan and Security Agreement
and Certain Other Loan Documents, entered into effective as of August 28, 1997,
by and between Lender and Borrower, and (vii) that certain Seventh Amendment to
Loan and Security Agreement, entered into effective as of November 1, 1996, by
and between Lender and Borrower (as amended, the "Loan Agreement").

     B. Borrower and Lender desire to amend the Loan Agreement and certain of
the other Loan Documents as hereinafter set forth.

     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:

                                        1

<PAGE>

                                    ARTICLE I
                                   Definitions

     1.01 Capitalized terms used in this Amendment are defined in the Loan
Agreement, as amended hereby, unless otherwise stated.

                                   ARTICLE II
                                   Amendments

     2.01 Amendment to Section 1.1 of the Loan Agreement; Amendment of Certain
Definitions. Effective as of the Effective Date, Section 1.1 of the Loan
Agreement is hereby amended by adding the following definitions thereto in
alphabetical order:

          "$1,000,000 Term Loan - the Loan described in Section 2.2(A-2) of this
     Agreement.

          $1,000,000 Term Note - the Secured Promissory Note to be executed by
     Borrower on or about the date of execution of the Eighth Amendment
     Agreement in favor of Lender to evidence the $1,000,000 Term Loan, which
     shall be in the form of Annex A to the Eighth Amendment.

          Eighth Amendment Agreement - the Eighth Amendment to Loan and Security
     Agreement, executed in December of 1997, by Lender and Borrower."

     2.02 Amendment to Section 1.1 of the Loan Agreement; Amendment to
Definition of "Loans". Effective as of the Effective Date, the definition of
"Loans" is hereby deleted it its entirety and the following shall be substituted
therefor:

          "Loans - all loans and advances made by Lender pursuant to this
     Agreement, including without limitation, all Revolving Credit Loans, the
     Term Loan, the $4,000,000 Term Loan, the $1,000,000 Term Loan, the
     Equipment Loans, each payment made pursuant to a guaranty of a foreign
     currency purchase contract and each payment made pursuant to a Letter of
     Credit."

     2.03 Amendment to Section 1.1 of the Loan Agreement; Amendment to
Definition of "Term Loans". Effective as of the Effective Date, the definition
of "Term Loans" is hereby deleted in its entirety, and the following shall be
substituted therefor:

     "Term Loans - the Term Loan, the $1,000,000 Term Loan and the $4,000,000
     Term Loan."

     2.04 Amendment to Section 1.1 of the Loan Agreement; Amendment to
Definition of "Notes". Effective as of the Effective Date, the definition of
"Notes" is hereby deleted in its entirety and the following shall be substituted
therefor:

                                        2

<PAGE>

           "Notes - the Term Note, the $4,000,000 Term Note, the $1,000,000 Term
     Note, the Equipment Notes and the Revolving Credit Notes."

     2.05 Amendment to Section 2 of the Loan Agreement; Amendment to Maximum
Amount of Total Credit Facility. Effective as of the Effective Date, the
reference to the dollar amount "$33,011,000" contained in the fourth line of
Section 2 Credit Facility is hereby deleted and substituted therefore is the
dollar amount "$33,911,000."

     2.06 Amendment to Section 2.2 of the Loan Agreement; Addition of New
Section 2.2(A-2). Effective as of the Effective Date, a new Section 2.2(A-2)
$1,000,000 Term Loan is hereby added to the Loan Agreement to read in its
entirety as follows:

           "(A-2) $1,000,000 Term Loan. Subject to the terms and conditions of
     this Agreement (including, without limitation, the terms, conditions and
     conditions precedent of the Eighth Amendment Agreement), Lender agrees to
     make a term loan to Borrower in connection with the Eighth Amendment
     Agreement in the principal amount of $1,000,000 (the '$1,000,000 Term
     Loan'), which shall be repayable in accordance with the terms of the
     $1,000,000 Term Note and shall be secured by the Collateral. The $1,000,000
     shall be funded upon the satisfaction of the conditions precedent specified
     in the Eighth Amendment Agreement in a manner satisfactory to Lender. The
     proceeds of the $1,000,000 Term Loan shall be used by Borrower solely for
     purposes for which the proceeds of the Revolving Credit Loans are
     authorized to be used."

     2.07 Amendment to Section 2.3(A) of the Loan Agreement. Effective as of the
Effective Date, Section 2.3(A) of the Loan Agreement is amended by adding after
the phrase "or any Equipment Note" the phrase "or the $1,000,000 Term Note."

          2.08 Amendment to Section 3.1(C) of the Loan Agreement. Effective as
of the date of execution of this Amendment, Section 3.1(C) of the Loan Agreement
is amended by deleting therefrom the reference to the phrase "Tex. Rev. Civ.
Stat. art. 5069-1.04(c)(Vernon 1987)" and substituting therefor the phrase
"Texas Revised Civil Statutes Annotated, Title 4 of the Texas Finance Code,
Chapter 303, as amended".

     2.09 Amendment to Section 3.5 of the Loan Agreement. Effective as of the
Effective Date, the first sentence of Section 3.5 of the Loan Agreement is
deleted and substituted therefor is the following sentence:

           "Principal and interest (i) on the Term Loan shall be payable as
     provided in the Term Note, (ii) on the $4,000,000 Term Loan shall be
     payable as provided in the $4,000,000 Term Note, (iii) on any Equipment
     Loan shall be payable as provided in the Equipment Note relating thereto,
     and (iv) on the $1,000,000 Term Loan shall be payable as provided in the
     $1,000,000 Term Note."

                                        3

<PAGE>

     2.10 Amendment to Section 12.19 of the Loan Agreement. Effective as of the
date of execution of this Amendment, Section 12.19 of the Loan Agreement is
amended and restated to read in its entirety as follows:

           "12.19 Nonapplicability of Chapter 303 of Texas Finance Code.
     Borrower and Lender hereby agree that the provisions of Texas Revised Civil
     Statutes Annotated Title 4 of the Texas Finance Code, Chapter 346 (which
     regulates certain revolving loan accounts and revolving triparty accounts)
     shall not apply to this Agreement or any of the other Loan Documents."

     2.11 Restructuring Fee. In consideration for the agreements of Lender
contained herein, including, without limitation, committing to make the
$1,000,000 Term Loan, but subject to Section 3.1(D) of the Loan Agreement,
Borrower agrees to pay Lender a fee of $50,000. Such fee shall be fully earned
on the date of execution of this Amendment. Such fee shall be due and payable
upon the earlier to occur of (i) July 31, 1998 or (i) termination of the Loan
Agreement. Borrower hereby irrevocably authorizes Lender, in Lender's sole
discretion, to advance to Borrower, and to charge on the earlier to occur of (i)
July 31, 1998 or (ii) termination of the Loan Agreement, to Borrower's Loan
Account hereunder as a Revolving Credit Loan, a sum sufficient to pay in full
this restructuring fee.

     2.12 Impact on Financial Covenants of Eighth Amendment Equity Infusion.
Lender and Borrower hereby agree that the amount of the Eighth Amendment Equity
Infusion (as hereinafter defined) shall be:

           (a) considered to be part of the Consolidated Tangible Net Worth of
     Borrower for the purpose of the calculation of the financial covenant
     specified at Section 9.3(A) of the Loan Agreement for the following periods
     (but only for the following periods):

                 (i) November 1, 1997 through December 31, 1997;
                 (ii) January 1, 1998 through January 31, 1998;
                 (iii) February 1, 1998 through February 28, 1998;
                 (iv) March 1, 1998 through March 31, 1998;
                 (v) April 1, 1998 through April 30, 1998;
                 (vi) May 1, 1998 through May 31, 1998; and
                 (vii) June 1, 1998 through June 30, 1998.

           (b) considered to be part of the Tangible Net Worth of Borrower for
     the purpose of the calculation of the financial covenant specified at
     Section 9.3(B) of the Loan Agreement for the following periods (but only
     for the following periods):

                 (i) December 1, 1997 through December 31, 1997;
                 (ii) January 1, 1998 through January 31, 1998;
                 (iii) February 1, 1998 through February 28, 1998;
                 (iv) March 1, 1998 through March 31, 1998;
                 (v) April 1, 1998 through April 30, 1998; and

                                        4

<PAGE>

                 (vi) May 1, 1998 through June 30, 1998.

           (c) added to the numerator of the Fixed Charge Ratio for the purpose
     of the calculation of the financial covenant specified at Section 9.3(C) of
     the Loan Agreement for the following periods (but only for the following
     periods):

                 (i)    six calendar month period ending on January 31, 1998;
                        and

                 (ii)   nine calendar month period ending on April 30, 1998.

                                   ARTICLE III
                              Conditions Precedent

     3.01 Conditions Precedent. The effectiveness of this Amendment is subject
to the satisfaction of the following conditions precedent, unless specifically
waived in writing by Lender:

           (a) Lender shall have received each of the following, each in form
and substance satisfactory to Lender: (i) this Amendment, duly executed by
Borrower; (ii) the Consent, Ratification and Release related to this Amendment,
duly executed by Darrell J. Lowrance; (iii) the $1,000,000 Term Note, in the
form of Annex A attached hereto, duly executed by Borrower; (iv) an Amended and
Restated Unconditional Guaranty, in the form of Annex B attached hereto, duly
executed by Darrell J. Lowrance; (v) Fourth Amendment to Mortgage, Security
Agreement, Financing Statement and Assignment of Rents, duly executed by
Lowrance regarding the existing Mortgage in favor of Lender covering Lowrance's
Tulsa, Oklahoma real property; and (vi) such additional documents, instruments
and information as Lender or its legal counsel may request;

          (b) Lender shall have received evidence satisfactory to Lender, in
Lender's sole discretion, that Borrower has received a new equity infusion of at
least $1,500,000 (the "Eighth Amendment Equity Infusion"), in the form of (i)
the purchase by certain officers of the Borrower of 68,500 shares of common
stock of Lowrance pursuant to the exercise of existing options held by such
officers, for a purchase price of $189,305.00, and (ii) the purchase by the
Board of Directors of Lowrance of approximately 342,000 shares of restricted
common stock of Lowrance at a purchase price per share of approximately $3.84,
for a total consideration of no less than $1,310,695.00;

          (c) The representations and warranties contained herein, in the Loan
Agreement and in the other Loan Documents, as each is amended hereby, shall be
true and correct as of the date hereof, as if made on the date hereof;

          (d) After giving effect to this Amendment, no Default or Event of
Default shall have occurred and be continuing, unless such Default or Event of
Default has been specifically waived in writing by Lender; and

                                        5

<PAGE>

          (e) All corporate proceedings taken in connection with the
transactions contemplated by this Amendment and all documents, instruments and
other legal matters incident thereto shall be satisfactory to Lender and its
legal counsel.

                                   ARTICLE IV
                                    No Waiver

     Nothing contained in this Amendment shall be construed as a waiver by
Lender of any covenant or provision of the Loan Agreement, the other Loan
Documents, this Amendment, or of any other contract or instrument between
Borrower and Lender, and the failure of Lender at any time or times hereafter to
require strict performance by Borrower of any provision thereof shall not waive,
affect or diminish any right of Lender to thereafter demand strict compliance
therewith. Lender hereby reserves all rights granted under the Loan Agreement,
the other Loan Documents, this Amendment and any other contract or instrument
between Borrower and Lender.

                                    ARTICLE V
                  Ratifications, Representations and Warranties

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

     5.02 Representations and Warranties. Borrower hereby represents and
warrants to Lender 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 Borrower and will not violate the Certificate of Incorporation or
Bylaws of Borrower; (b) the representations and warranties contained in the Loan
Agreement, as amended hereby, and any other Loan Documents are true and 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 Loan Agreement, as amended hereby, has occurred and is continuing; (d)
Borrower is in full compliance with all covenants and agreements contained in
the Loan Agreement and the other Loan Documents, as amended hereby; (e) the
Borrower's Certificate of Incorporation and Bylaws are in full force and effect
on and as of the date hereof without modification or amendment in any respect
since November 1, 1996; (f) as of the date hereof, (i) Borrower is in existence
and in corporate and tax good standing in the State of its organization, (ii)
the Borrower is qualified to do business as a foreign corporation and is in
corporate and tax good standing in each jurisdiction where Borrower is doing
business and is required to be so qualified, (iii) Borrower does not owe
franchise taxes or other taxes required to maintain its corporate existence and
no franchise tax reports are due, and

                                        6

<PAGE>

(iv) no proceedings are pending for forfeiture of the Borrower's charter or for
its dissolution either voluntarily or involuntarily; and (g) the officer of
Borrower executing this Amendment has been duly elected and is, at present,
qualified and acting in the office indicated below such officer's name and is
duly authorized to execute this Amendment on behalf of Borrower.

                                   ARTICLE VI
                            Miscellaneous Provisions

     6.01 Survival of Representations and Warranties. All representations and
warranties made in the Loan Agreement or any other Loan Document, including,
without limitation, any document furnished in connection with this Amendment,
shall survive the execution and delivery of this Amendment and the other Loan
Documents, and no investigation by Lender or any closing shall affect the
representations and warranties or the right of Lender to rely upon them.

     6.02 Reference to Loan Agreement. Each of 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 Loan Agreement, as amended hereby, are hereby amended so that
any reference in the Loan Agreement and such other Loan Documents to the Loan
Agreement shall mean a reference to the Loan Agreement, as amended hereby.

     6.03 Expenses of Lender. As provided in the Loan Agreement, Borrower agrees
to pay on demand all costs and expenses incurred by Lender in connection with
the preparation, negotiation and execution of this Amendment and the other Loan
Documents executed pursuant hereto and any and all amendments, modifications,
and supplements thereto, including, without limitation, the costs and fees of
Lender's legal counsel, and all costs and expenses incurred by Lender in
connection with the enforcement or preservation of any rights under the Loan
Agreement, as amended hereby, or any other Loan Documents, including, without,
limitation, the costs and fees of Lender's legal counsel.

     6.04 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.

     6.05 Successors and Assigns. This Amendment is binding upon and shall inure
to the benefit of Lender and Borrower and their respective successors and
assigns, except that Borrower may not assign or transfer any of its rights or
obligations hereunder without the prior written consent of Lender.

     6.06 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.

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<PAGE>

     6.07 Effect of Waiver. No consent or waiver, express or implied, by Lender
to or for any breach of or deviation from any covenant or condition by Borrower
shall be deemed a consent to or waiver of any other breach of the same or any
other covenant, condition or duty.

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

     6.09 Applicable Law. THIS AMENDMENT AND ALL OTHER LOAN DOCUMENTS EXECUTED
PURSUANT HERETO SHALL BE DEEMED TO HAVE BEEN MADE AND TO BE PERFORMABLE IN AND
SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
TEXAS.

     6.10 Final Agreement. THE LOAN AGREEMENT AND THE OTHER LOAN DOCUMENTS, EACH
AS AMENDED HEREBY, REPRESENT THE ENTIRE EXPRESSION OF THE PARTIES WITH RESPECT
TO THE SUBJECT MATTER HEREOF ON THE DATE THIS AMENDMENT IS EXECUTED. THE LOAN
AGREEMENT AND THE OTHER LOAN DOCUMENTS, AS AMENDED HEREBY, 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 BORROWER AND
LENDER.

     6.11 Release. BORROWER 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 "OBLIGATIONS" OR TO SEEK AFFIRMATIVE RELIEF OR DAMAGES OF
ANY KIND OR NATURE FROM LENDER. BORROWER HEREBY VOLUNTARILY AND KNOWINGLY
RELEASES AND FOREVER DISCHARGES LENDER, ITS PREDECESSORS, OFFICERS, DIRECTORS,
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 BORROWER MAY NOW OR
HEREAFTER HAVE AGAINST LENDER, ITS PREDECESSORS, OFFICERS, DIRECTORS, 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

                                        8

<PAGE>

OR OTHER LOAN DOCUMENTS, AND THE NEGOTIATION OF AND EXECUTION OF THIS AMENDMENT.
                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                        9

<PAGE>

     IN WITNESS WHEREOF, this Amendment has been executed and is effective as of
the date first above-written.

                                 "LENDER"

                                 FLEET CAPITAL CORPORATION

                                 By: /s/ Hance VanBeber
                                     ----------------------------------
                                 Name: Hance VanBeber
                                 Title: Vice President

                                 "BORROWER"

                                 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

                                 SEA ELECTRONICS, INC.

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

                                       10

<PAGE>

                        CONSENT, RATIFICATION AND RELEASE

     The undersigned hereby consents to the terms of the within and foregoing
Eighth Amendment to Loan and Security Agreement, confirms and ratifies the terms
of his unconditional guaranty and acknowledges that his unconditional guaranty
is in full force and effect on the date executed, that he has no defense,
counterclaim, set-off or any other claim to diminish his liability under such
document, that his consent is not required to the effectiveness of the within
and foregoing document, and that no consent by him is required for the
effectiveness of any future amendment, modification, forbearance or other action
with respect to the Loans, the Collateral, or any Loan Documents. THE
UNDERSIGNED HEREBY VOLUNTARILY AND KNOWINGLY RELEASES AND FOREVER DISCHARGES
LENDER, 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 UNDERSIGNED MAY NOW OR HEREAFTER HAVE AGAINST LENDER, 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 ANY OF THE OTHER
LOAN DOCUMENTS, AND NEGOTIATION FOR AND EXECUTION OF THIS AMENDMENT.

                                        /s/ Darrell J. Lowrance
                                        ---------------------------------
                                        Darrell J. Lowrance

                                       11<PAGE>

                                                                   EXHIBIT 10.29

                               NINTH AMENDMENT TO
                           LOAN AND SECURITY AGREEMENT

          THIS NINTH AMENDMENT TO LOAN AND SECURITY AGREEMENT (the "Amendment")
is made and entered into as of the 14th day of September, 1998, to be effective
(unless otherwise specified herein) as of September 14, 1998 (the "Effective
Date"), by and among FLEET CAPITAL CORPORATION, a Rhode Island corporation,
successor in interest by merger to FLEET CAPITAL CORPORATION, a Connecticut
corporation, formerly known as SHAWMUT CAPITAL CORPORATION, successor in
interest by assignment to BARCLAYS BUSINESS CREDIT, INC. ("Lender"), LOWRANCE
ELECTRONICS, INC., a Delaware corporation ("Lowrance"), LEI EXTRAS, INC., a
Delaware corporation ("LEI"), LOWRANCE CONTRACTS, INC., a Delaware corporation
("Lowrance Contracts"), and SEA ELECTRONICS, INC., an Oklahoma corporation ("Sea
Electronics") (Lowrance, LEI, Lowrance Contracts and Sea Electronics are herein
individually and collectively called "Borrower").

                                    RECITALS

          A. Borrower, Lowrance Australia Pty Limited ("Lowrance Australia") and
Lender have entered into that certain Loan and Security Agreement, dated
December 15, 1993, as amended by (i) that certain First Amendment to Loan and
Security Agreement, dated October 16, 1995, by and among Lender, Borrower and
Lowrance Australia, (ii) that certain Second Amendment to Loan and Security
Agreement, dated November 1, 1996 by and among Lender and Borrower, (iii) that
certain Third Amendment to Loan and Security Agreement, dated December 30, 1996,
by and among Lender and Borrower, (iv) that certain Fourth Amendment to Loan and
Security Agreement, entered into effective as of April 1, 1997, by and among
Lender and Borrower, (v) that certain Fifth Amendment to Loan and Security
Agreement, entered into effective as of August 25, 1997, by and between Lender
and Borrower ("Fifth Amendment"), (vi) that certain Sixth Amendment to Loan and
Security Agreement and Certain Other Loan Documents, entered into effective as
of August 28, 1997, by and between Lender and Borrower, (vii) that certain
Seventh Amendment to Loan and Security Agreement, entered into effective as of
November 1, 1996, by and between Lender and Borrower, and (viii) that certain
Eighth Amendment to Loan and Security Agreement, made and entered into as of
December 9, 1997, by and between Lender and Borrower (as amended, the "Loan
Agreement").

          B. Borrower and Lender desire to amend the Loan Agreement and certain
of the other Loan Documents as hereinafter set forth.

          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 Capitalized terms used in this Amendment are defined in the Loan
Agreement, as amended hereby, unless otherwise stated.

                                   ARTICLE II

                                        1

<PAGE>

                                   Amendments

     2.01 Amendment to Section 1.1 of the Loan Agreement; Amendment of Certain
Definitions. Effective as of the Effective Date, Section 1.1 of the Loan
Agreement is hereby amended by adding the following definitions thereto in
alphabetical order:

           "Ninth Amendment Agreement - the Ninth Amendment to Loan and Security
     Agreement, executed in September of 1998, by Lender and Borrower."

     2.02 Amendment to Section 9.3 of the Loan Agreement. Effective as of the
Effective Date, Section 9.3 of the Loan Agreement is deleted in its entirety,
and the following is substituted therefor:

           "9.3 Specific Financial Covenants. During the term of this Agreement,
and thereafter for so long as there are any Obligations to Lender, Borrower
covenants that, unless otherwise consented to by Lender in writing, it shall:

                 (A) Minimum Tangible Net Worth. Maintain a Consolidated
Tangible Net Worth of not less than the amount indicated below on the last day
of each calendar month during the period corresponding thereto:

<TABLE>
<CAPTION>
                  PERIOD                                     AMOUNT
                  ------                                     ------
<S>                                                     <C>
(a) August 1, 1998 through August 31, 1998              (a) $ 8,788,000
(b) September 1, 1998 through September 30, 1998        (b) $ 8,432.000
(c) October 1, 1998 through October 31, 1998            (c) $ 8,263,000
(d) November 1, 1998 through November 30, 1998          (d) $ 8,099,000
(e) December 1, 1998 through December 31, 1998          (e) $ 7,961,000
(f) January 1, 1999 through January 31, 1999            (f) $ 7,918,000
(g) February 1, 1999 through February 28, 1999          (g) $ 8,530,000
(h) March 1, 1999 through March 31, 1999                (h) $ 9,128,000
(i) April 1, 1999 through April 30, 1999                (i) $ 9,743,000
(j) May 1, 1999 through May 31, 1999                    (j) $10,053,000
(k) June 1, 1999 through June 30, 1999                  (k) $10,185,000
(l) July 1, 1999 and thereafter                         (l) $10,262,000
</TABLE>

                 (B) Maximum Leverage Ratio. Maintain, on a Consolidated basis,
a ratio of (i) total Indebtedness to (ii) Tangible Net Worth of not more than
the ratio shown below as of the last day of each calendar month during the
period corresponding thereto:

                                        2

<PAGE>

<TABLE>
<CAPTION>
                  PERIOD                                      RATIO
                  ------                                      -----
<S>                                                     <C>
(a) August 1, 1998 through August 31, 1998              (a)  5.4 to 1.0
(b) September 1, 1998 through September 30, 1998        (b)  5.6 to 1.0
(c) October 1, 1998 through October 31, 1998            (c)  5.4 to 1.0
(d) November 1, 1998 through November 30, 1998          (d)  5.5 to 1.0
(e) December 1, 1998 through December 31, 1998          (e)  5.6 to 1.0
(f) January 1, 1999 through January 31, 1999            (f)  5.9 to 1.0
(g) February 1, 1999 through February 28, 1999          (g)  5.7 to 1.0
(h) March 1, 1999 through March 31, 1999                (h)  5.3 to 1.0
(i) April 1, 1999 through April 30, 1999                (i)  4.5 to 1l.0
(j) May 1, 1999 through May 31, 1999                    (j)  4.0 to 1.0
(k) June 1, 1999 through June 30, 1999                  (k)  3.4 to 1.0
(l) July 1, 1999 through April 30, 2000                 (l)  3.5 to 1.0
(m) May 1, 2000 through July 31, 2000                   (m)  4.5 to 1.0
(n) August 1, 2000 through April 30, 2001               (n)  3.5 to 1.0
(o) May 1, 2001 through July 31, 2001                   (o)  4.5 to 1.0
(p) August 1, 2001 through December 31, 2001            (p)  3.5 to 1.0
</TABLE>

                 (C) Fixed Charge Ratio. Maintain, on a Consolidated basis, a
fixed Charge Ratio of not less than the ratio shown below for the periods
corresponding thereto.

<TABLE>
<CAPTION>
                   PERIOD                                   RATIO
                   ------                                   -----
<S>                                                     <C>
(a) Three calendar month period ending on
    October 31, 1998                                    (a)  0.3 to 1.0
(b) Six calendar month period ending on January
    31, 1999                                            (b)  0.4 to 1.0
(c) Nine calendar month period ending on April
    30, 1999                                            (c)  0.9 to 1.0
(d) Twelve calendar month period ending on July
    31, 1999                                            (d)  1.0 to 1.0
(e) Twelve calendar month period ending on the
    last day of each thereafter occurring
    October, January, April and July                    (e)  1.0 to 1.0
</TABLE>

     2.03 Deletion of Cure Period for Violation of Section 9.3(C) of the Loan
Agreement. Effective as of the date of execution of this Amendment, the cure
period for a violation of Section 9.3(C) of the Loan Agreement set forth in
Section 2.31 of the Fifth Amendment is hereby deleted.

     2.04 Amendment to Section 11.1 of the Loan Agreement; Addition of New
Section 11.1(Q). Effective as of the Effective Date, a new Section 11.1(Q),
Additional $3,000,000 in Cash Equity by November 30, 1998, is added to the Loan
Agreement to read in its entirety as follows:

                                        3

<PAGE>

                 "(Q) Additional $3,000,000 in Cash Equity by November 30, 1998.
     Borrower fails by November 30, 1998 to supply evidence satisfactory to
     Lender, in Lender's sole discretion, that Lowrance Electronics, Inc. has
     received after the date of execution of the Ninth Amendment an additional
     $3,000,000 in cash in the form of either additional equity or new
     Subordinated Debt, such additional equity and Subordinated Debt to be upon
     terms and conditions and pursuant to documentation satisfactory to Lender,
     in Lender's sole discretion."

                                   ARTICLE III
                              Conditions Precedent

     3.01 Conditions Precedent. The effectiveness of this Amendment is subject
to the satisfaction of the following conditions precedent, unless specifically
waived in writing by Lender:

           (a) Lender shall have received each of the following, each in form
and substance satisfactory to Lender: (i) this Amendment, duly executed by
Borrower; and (ii) such additional documents, instruments and information as
Lender or its legal counsel may request;

           (b) The representations and warranties contained herein, in the Loan
Agreement and in the other Loan Documents, as each is amended hereby, shall be
true and correct as of the date hereof, as if made on the date hereof;

           (c) After giving effect to this Amendment, no Default or Event of
Default shall have occurred and be continuing, unless such Default or Event of
Default has been specifically waived in writing by Lender; and

           (d) All corporate proceedings taken in connection with the
transactions contemplated by this Amendment and all documents, instruments and
other legal matters incident thereto shall be satisfactory to Lender and its
legal counsel.

                                   ARTICLE IV
                                    No Waiver

          Upon satisfaction of the conditions and covenants set forth in Section
3.01 of this Amendment, Lender hereby waives any Default or Event of Default
which occurred due to the violation by Borrower of the following covenants in
the Loan Agreement:

          (a) Borrower respectively failed for the period beginning on June 1,
1998 and continuing through June 30, 1998, and the period beginning on July 1,
1998 and continuing through July 31, 1998, to maintain a Consolidated Tangible
Net Worth of not less than the amount set forth in Section 9.3(A) of the Loan
Agreement, each of which is a violation of Section 9.3(A) of the Loan Agreement;

          (b) Borrower respectively failed for the period beginning on June 1,
1998, and continuing through June 30, 1998, and the period beginning on July 1,
1998, and continuing through July 31, 1998, to maintain a ratio of total
Indebtedness to Tangible Net Worth of not more than the ratio set forth in
Section 9.3(B) of the Loan Agreement, each of which is a violation of Section
9.3(B) of the Loan Agreement; and

                                        4

<PAGE>

          (c) Borrower failed to maintain for the twelve calendar month period
ending on July 31, 1998, a Fixed Charge Ratio of not less than the ratio set
forth in Section 9.3(C) of the Loan Agreement, which is a violation of Section
9.3(C) of the Loan Agreement.

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

                                    ARTICLE V
                  Ratifications, Representations and Warranties

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

          5.02 Representations and Warranties. Borrower hereby represents and
warrants to Lender 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 Borrower and will not violate the Certificate of Incorporation or
Bylaws of Borrower; (b) the representations and warranties contained in the Loan
Agreement, as amended hereby, and any other Loan Documents are true and 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 Loan Agreement, as amended hereby, has occurred and is continuing; (d)
Borrower is in full compliance with all covenants and agreements contained in
the Loan Agreement and the other Loan Documents, as amended hereby; (e) the
Borrower's Certificate of Incorporation and Bylaws are in full force and effect
on and as of the date hereof without modification or amendment in any respect
since November 1, 1996; (f) as of the date hereof, (i) Borrower is in existence
and in corporate and tax good standing in the State of its organization, (ii)
the Borrower is qualified to do business as a foreign corporation and is in
corporate and tax good standing in each jurisdiction where Borrower is doing
business and is required to be so qualified, (iii) Borrower does not owe
franchise taxes or other taxes required to maintain its corporate existence and
no franchise tax reports are due, and (iv) no proceedings are pending for
forfeiture of the Borrower's charter or for its dissolution either voluntarily
or involuntarily; and (g) the officer of Borrower executing this Amendment has
been duly elected and is, at present, qualified and acting in the office
indicated below such officer's name and is duly authorized to execute this
Amendment on behalf of Borrower.

                                   ARTICLE VI
                            Miscellaneous Provisions

          6.01 Survival of Representations and Warranties. All representations
and warranties made in the Loan Agreement or any other Loan Document, including,
without limitation, any document furnished

                                        5

<PAGE>

in connection with this Amendment, shall survive the execution and delivery of
this Amendment and the other Loan Documents, and no investigation by Lender or
any closing shall affect the representations and warranties or the right of
Lender to rely upon them.

          6.02 Reference to Loan Agreement. Each of 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 Loan Agreement, as amended hereby, are hereby amended so
that any reference in the Loan Agreement and such other Loan Documents to the
Loan Agreement shall mean a reference to the Loan Agreement, as amended hereby.

          6.03 Expenses of Lender. As provided in the Loan Agreement, Borrower
agrees to pay on demand all costs and expenses incurred by Lender in connection
with the preparation, negotiation and execution of this Amendment and the other
Loan Documents executed pursuant hereto and any and all amendments,
modifications, and supplements thereto, including, without limitation, the costs
and fees of Lender's legal counsel, and all costs and expenses incurred by
Lender in connection with the enforcement or preservation of any rights under
the Loan Agreement, as amended hereby, or any other Loan Documents, including,
without, limitation, the costs and fees of Lender's legal counsel.

          6.04 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.

          6.05 Successors and Assigns. This Amendment is binding upon and shall
inure to the benefit of Lender and Borrower and their respective successors and
assigns, except that Borrower may not assign or transfer any of its rights or
obligations hereunder without the prior written consent of Lender.

          6.06 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.

          6.07 Effect of Waiver. No consent or waiver, express or implied, by
Lender to or for any breach of or deviation from any covenant or condition by
Borrower shall be deemed a consent to or waiver of any other breach of the same
or any other covenant, condition or duty.

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

          6.09 Applicable Law. THIS AMENDMENT AND ALL OTHER LOAN DOCUMENTS
EXECUTED PURSUANT HERETO SHALL BE DEEMED TO HAVE BEEN MADE AND TO BE PERFORMABLE
IN AND SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF TEXAS.

          6.10 Final Agreement. THE LOAN AGREEMENT AND THE OTHER LOAN DOCUMENTS,
EACH AS AMENDED HEREBY, REPRESENT THE ENTIRE EXPRESSION OF THE PARTIES WITH
RESPECT TO THE SUBJECT MATTER HEREOF ON THE DATE THIS AMENDMENT IS EXECUTED. THE
LOAN AGREEMENT AND THE OTHER LOAN DOCUMENTS, AS AMENDED HEREBY, 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

                                        6

<PAGE>

THIS AMENDMENT SHALL BE MADE, EXCEPT BY A WRITTEN AGREEMENT SIGNED BY BORROWER
AND LENDER.

          6.11 Release. BORROWER 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 "OBLIGATIONS" OR TO SEEK AFFIRMATIVE RELIEF OR DAMAGES OF
ANY KIND OR NATURE FROM LENDER. BORROWER HEREBY VOLUNTARILY AND KNOWINGLY
RELEASES AND FOREVER DISCHARGES LENDER, ITS PREDECESSORS, OFFICERS, DIRECTORS,
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 BORROWER MAY NOW OR
HEREAFTER HAVE AGAINST LENDER, ITS PREDECESSORS, OFFICERS, DIRECTORS, 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 OTHER LOAN DOCUMENTS, AND THE NEGOTIATION
OF AND EXECUTION OF THIS AMENDMENT.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                        7

<PAGE>

     IN WITNESS WHEREOF, this Amendment has been executed and is effective as of
the date first above-written.

                                 "LENDER"

                                 FLEET CAPITAL CORPORATION

                                 By: /s/ Hance VanBeber
                                     ----------------------------------
                                 Name: Hance VanBeber
                                 Title: Vice President

                                 "BORROWER"

                                 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

                                 SEA ELECTRONICS, INC.

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

                                        8

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