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                                                                    EXHIBIT 10
                                       
                      AMENDMENT TO AGREEMENT RE RELEASE 
                         OF CERTAIN TITAN INFORMATION
                        SYSTEMS CORPORATION COLLATERAL

This Amendment to Agreement Re Release of Certain Titan Information Systems 
Corporation Collateral ("Amendment") is entered into by and among the Titan 
Corporation, a Delaware corporation ("Borrower"), Imperial Bank, a California 
banking corporation ("Imperial"), Sumitomo Bank of California, a California 
banking corporation ("Sumitomo") (Imperial and Sumitomo are collectively 
referred to herein as the "Banks"), and Sumitomo in its capacity as agent for 
Sumitomo and Imperial (the "Agent"), and is dated as of February 25, 1998. 
Reference is hereby made to (1) that certain Agreement Re Release of Certain 
Titan Information Systems Corporation Collateral dated as of December 8, 1997 
(the "Collateral Release Agreement"); (2) that certain Amended and Restated 
Commercial Loan Agreement dated as of May 15, 1997 by and between Borrower, 
the Banks and Agent (the "Loan Agreement"), and (3) that certain Amendment to 
Existing Security Documents between the Banks, Agent, Borrower, and Titan 
Information Systems Corporation, a Delaware corporation ("TISC") dated as of 
May 15, 1997 (the "Amendment to Existing Security Documents").  Capitalized 
terms used but not otherwise defined herein shall have the meaning set forth 
in the Loan Agreement, the Collateral Release Agreement, and the Amendment to 
Existing Security Documents.

                                  I. RECITALS
                                          
     A.   TISC has changed its name to Linkabit Wireless, Inc. ("Linkabit"). 
     Linkabit is engaged in an initial public offering of its stock (the 
     "IPO"). The IPO was expected to be finalized by March 15, 1998.

     B.   The IPO has not been completed and Borrower and Linkabit have
     requested that the Banks and Agent extend the time for Linkabit to repay
     certain loans and accommodations to Borrower as set forth in the 
     Collateral Release Agreement.

     C.   Borrower further desires to amend certain financial reporting
     requirements in the Collateral Release Agreement and the Loan Agreement.

     D.   Borrower desires from time to time to form subsidiaries, affiliates 
     or other related entities, and the Banks wish to establish requirements 
     under the Loan Agreement in connection with the formation of any such 
     entities.

     E.   The Banks and Agent are willing to consent to such modifications on
     the terms and subject to the condition set forth below.

                               II. AGREEMENT
                                          
     Now, therefore, it is hereby agreed by and between the parties hereto as
follows.

     1.        Paragraph 3C of the Collateral Release Agreement is amended to
     change the date of March 15, 1998, appearing in the 10th, 16th and 21st
     lines of said paragraph, to June 30, 1998.
     

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     2.        The second sentence of paragraph 4 of the Collateral Release
     Agreement is deleted and is replaced by the following:

          "In addition, on or before February 28, 1998, Borrower shall provide
          to each of the Banks, in form and detail reasonably acceptable to 
          each of the Banks, a detailed post-closing balance sheet of Borrower 
          and a post-closing, opening balance sheet of Linkabit."
          
     3.        The first sentence of section 6.2(e) of the Loan Agreement is
     hereby amended to read as follows:

          "Borrower will submit annual projections prepared by quarter, for 
          each new fiscal year contemporaneously with Borrower's delivery of 
          its fiscal year-end financial statements."
          
     4.        Paragraph 6.26 is added to the Loan Agreement to read as follows:

          "Borrower will not form any new subsidiary, affiliate or related
          entity nor transfer any of Borrower's assets to any subsidiary,
          affiliate or related entity without first obtaining the written
          consent of Agent to do so, which consent shall not be unreasonably
          withheld.  At any time that Borrower forms a new subsidiary,
          affiliate, or other related entity, it will upon request of Agent or
          either of the Banks, execute and deliver a continuing guaranty,
          security agreement, and financing statement (UCC-1), together with
          such other documents required by Agent or either of the Banks in form
          and substance satisfactory to Banks, executed by such entity,
          providing assurance to Banks that Banks' lien on all of Borrower's
          assets and the assets of Borrower's subsidiaries, affiliates and
          related entities is a first lien on all such assets."
               
     5.        The Collateral Release Agreement, the Loan Agreement, and the
     Amendment to Existing Security Documents remain unmodified and in full
     force and effect, except as otherwise amended hereby.

     This Amendment is executed as of the date first written above.
     
                              "Borrower"

                              THE TITAN CORPORATION, A Delaware
                              corporation

                              By: /s/ ERIC M. DEMARCO
                                  -------------------------------
                                  Eric M. DeMarco
                                  Senior Vice President
                                  Chief Financial Officer
                                          
                                          
                                          
                              "Banks"
                                          
                              THE SUMITOMO BANK OF CALIFORNIA,
                              a California banking corporation, 
                              in its individual capacity

                              By: /s/ SAJEDA SIMJEE
                                  ----------------------------------


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                                  Sajeda Simjee, Vice President
                                          
                                          
                              IMPERIAL BANK, a California banking
                              corporation
                              
                              By: /s/ TIM BUBNACK
                                  --------------------------------------
                                  Tim Bubnack, Vice President
                                          
                                      "Agent"
                                          
                              THE SUMITOMO BANK OF CALIFORNIA,
                              a California banking corporation, as
                              Agent for itself and Imperial Bank

                              By: /s/ SAJEDA SIMJEE
                                  --------------------------------------
                                  Sajeda Simjee, Vice President