Exhibit 99.1

                                CERTIFICATION OF
                             CHIEF EXECUTIVE OFFICER
                        OF SPINNAKER EXPLORATION COMPANY
                         PURSUANT TO 18 U.S.C. (S) 1350

     In connection with the accompanying Annual Report of Spinnaker Exploration
Company (the "Company") on Form 10-K for the period ended December 31, 2002 and
filed with the Securities and Exchange Commission on the date hereof (the
"Report"), I, Roger L. Jarvis, Chief Executive Officer of the Company, hereby
certify, to my knowledge, that:

         1.   The Report fully complies with the requirements of Section 13(a)
              or 15(d) of the Securities Exchange Act of 1934; and

         2.   The information contained in the Report fairly presents, in all
              material respects, the financial condition and results of
              operations of the Company.

         /s/ ROGER L. JARVIS
         --------------------------------------------
         Name:  Roger L. Jarvis
         Title: Chief Executive Officer
         Date:  March 25, 2003

     A signed original of this written statement required by Section 906 has
been provided to Spinnaker Exploration Company and will be retained by Spinnaker
Exploration Company and furnished to the Securities and Exchange Commission or
its staff upon request.