A BE20 CREW; TAXIING FOR TKOF AT DET; TAXIED PAST THE HOLD SHORT LINE.

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WE STARTED OUR ENGS AND DID OUR USUAL PRE-TAXI CHKS AND GOT CLRED TO TAXI TO RWY 33. I WAS THE PF (TAXIING). MY FO WAS NEW TO THE POS AND SOMEWHAT UNFAMILIAR OR NOT QUICK ENOUGH (I THOUGHT) IN GETTING THE GPS RECEIVER SET UP. SO WHILE TAXIING; I LET MYSELF BECOME INVOLVED WITH PUTTING THE WAYPOINTS (FIXES) INTO THE GPS RECEIVER. SO AS I MADE THE TURN FROM THE TXWY TO THE START OF RWY 33 I INADVERTENTLY WENT ACROSS THE HOLD SHORT LINE BY SOME 50 FT. I DISCOVERED THIS AND I IMMEDIATELY STOPPED. FORTUNATELY; THERE WAS NO INBOUND OR OUTBOUND TFC. ABOUT THAT TIME; THE GND CTLR ADMONISHED ME AND CLRED ME ACROSS THE RWY TO THE OTHER SIDE TXWY WHERE I COULD MAKE A 180 DEG TURN AND TAXI BACK AND HOLD SHORT. WHEN WE WERE READY FOR TKOF; WE WERE CLRED TO GO. CORRECTIVE ACTIONS: IN THE FUTURE; AFTER OBTAINING OUR CLRNC; I WILL LOAD OR OVERSEE LOADING OF THE GPS BEFORE TAXIING. THEN SUBSEQUENTLY WHILE TAXIING; I WILL MAINTAIN FULL ATTN TO THE JOB OF MOVING THE ACFT AND NOT INVOLVE MYSELF WITH FLT NAV UNTIL I STOP THE ACFT AND THEN REVIEW NAV AND COM ISSUES.