FLT ATTENDANT RPT REGARDING A PAX ON BOARD AN S80 WHO WAS USING A GPS WITH VHF RADIO DURING FLT. FLT ATTENDANT REQUESTED IT BE TURNED OFF. IT WAS TEMPORARILY; THEN TURNED ON AGAIN. THE GPS WAS CONFISCATED AND CAPT KEPT IT DURING THE FLT.

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WHILE SITTING ON THE JUMP SEAT I HEARD COCKPIT RADIO XMISSIONS. I WALKED THROUGH THE CABIN TO LOCATE THE DEVICE. PAX X HAD ON A GPS WITH VHF RADIO. I ASKED HIM TO TURN IT OFF AND KEEP IT OFF FOR THE REMAINDER OF THE FLT. AT THIS TIME WE WERE ROLLING TOWARD THE RWY AFTER A BRIEF GND DELAY IN DFW. HE DID PUT IT AWAY AT THAT TIME UNDER PROTEST. HE INFORMED ME HE WAS A FLT INSTRUCTOR AND HAD READ THE BOEING MANUAL AND FELT IT STATED HE HAD THE RIGHT TO USE HIS DEVICE AND THAT IT WOULD NOT INTERFERE. I TRIED TO EXPLAIN THAT VHF RADIOS WERE NEVER ALLOWED FOR USE ON THE ACFT. AFTER TKOF AS I WALKED THROUGH THE CABIN HE HAD IT OUT AGAIN; IT WAS ON AND HE WAS IN THE PROCESS OF HOOKING UP HEAD PHONES WITH A MICROPHONE ATTACHED. I ASKED HIM AGAIN TO TURN IT OFF. HE AGAIN PROTESTED. I REQUESTED THE DEVICE TO TAKE TO THE COCKPIT. THE CAPT KEPT IT FOR THE REMAINDER OF THE FLT. LATER IN THE FLT; MR X CAME BACK TO WHERE THE #1 FLT ATTENDANT AND I WERE STANDING. HE BECAME VERY ARGUMENTATIVE WITH US OVER NOT BEING ABLE TO USE HIS DEVICE; USING THE ARGUMENT OVER AND OVER THAT HE WAS A FLT INSTRUCTOR. NOT UNTIL AFTER NUMEROUS TIMES OF REMINDING HIM HE WAS NOT IN CHARGE OF THIS ACFT AND INTERFERING WITH CREW MEMBERS' INSTRUCTIONS DID HE STOP. REGARDING MY PERCEPTION; JUDGEMENT AND DECISIONS: I APPRECIATE THE CAPT CONFISCATING THE DEVICE. I STAND BY MY PERSONAL ACTIONS. I DO NOT; HOWEVER; HAVE ANY RESPECT FOR THIS MAN AS AN AVIATOR; HE WAS DEFINITELY INTERFERING WITH MY ABILITY TO DO MY JOB.