PLT OF AN SEL SMA DELAYED TURNING ON COURSE HDG DUE TO EXPLAINING THE GPS NAV SYS TO A PLT PAX IN THE R SEAT.

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WHILE RECEIVING VECTOR DURING CLB; I WAS CLRED TO MARATHON NDB. I WAS DEMONSTRATING VARIOUS FEATURES OF EFIS TO PAX IN R SEAT WHEN ATC CLRED ME TO ORL THEN ON COURSE. INSTEAD OF TURNING TOWARD ORL IMMEDIATELY; I PROGRAMMED WHOLE RTE INTO GPS (EXPLAINING THIS TO PAX) AND CONTINUED FOR ANOTHER 2-3 MINS BEFORE STARTING THE TURN N. TO MY KNOWLEDGE THERE WERE NO OTHER ACFT INVOLVED AND NO TFC CONFLICTS AROSE. I WAS IN THE TURN TO ORL WHEN ATC CALLED ASKING FOR MY HDG. CONTRIBUTING FACTORS: I WAS AT FAULT FOR LETTING PAX DISTRACT ME WITH QUESTIONS UNTIL COMPLETING IMMEDIATE TASK. IN ADDITION; I SHOULD HAVE BRIEFED PAX ON WHEN I WOULD BE ABLE TO GIVE EXPLANATIONS AND I SHOULD HAVE INSISTED THAT HE BECOME AWARE OF MY CALL SIGN SO AS NOT TO INTERRUPT. MY PAX WAS AN EXPERIENCED PLT AND I EXPECTED HIM TO ACT ACCORDINGLY. CORRECTIVE ACTION: IN THE FUTURE; I WILL BRIEF PAX MORE THOROUGHLY ABOUT WHEN THEY ARE ALLOWED TO ASK DETAILED QUESTIONS AND MAKE SURE I COMPLETE TASK PRIOR TO GIVING EXPLANATION. IF I AM ASKED TO CHK OUT A PLT IN THIS TYPE ACFT I WILL MAKE SURE THEY HAVE DETAILED UNDERSTANDING OF SYS PRIOR TO FLYING THE ACFT.