NAV COMPASS SYS ERROR CAUSES NAV DEV. PAX ELECTRONIC DEVICES IN USE.

Narrative

FLT LEFT EWR ON A RETURN FLT TO DFW. AFTER DEP; WE WERE INSTRUCTED BY NY DEP TO PROCEED DIRECTLY TO PARKE INTXN. BEFORE REACHING PARKE INTXN; NY DEP CTL INSTRUCTED US TO TURN 10 DEGS L AND INTERCEPT THE LRP 067 DEG RADIAL AND PROCEED INBOUND. UPON INTERCEPTING THE LRP 067 DEG RADIAL AND PASSING 13000 FT; NY DEP ADVISED US THAT WE WERE S OF COURSE. THE FLC SEEMED PUZZLED BECAUSE OUR NAV INSTS AT THE TIME (VOR) WERE SHOWING US ON THE RADIAL. ONCE PAST LRP AND BTWN FLIRT INTXN AND MRB; THE ACFT WAS BEING COUPLED TO THE INERTIAL NAV SYS. WHILE FOLLOWING THE COMMANDS OF THE INS; ZNY ASKED 'WHERE ARE YOU GOING?' UPON HEARING THIS XMISSION; THE FLC IMMEDIATELY REALIZED SOMETHING WAS WRONG AND ASKED THE #1 FLT ATTENDANT TO CHK THE CABIN FOR USAGE OF ILLEGAL ELECTRONIC DEVICES. WHILE SHE WAS DOING THAT TASK; THE FLC NOTICED THAT BOTH NAV COMPASS SYS WERE IN ERROR BY 40 DEGS WITH THE WET COMPASS. UPON ADVISING CTR OF THIS PROB; THEY GAVE US A VECTOR TOWARDS MRB. AT THE SAME TIME; THE #1 FLT ATTENDANT RETURNED AND ADVISED US THAT THERE WERE 2 GAME BOYS IN USE (ELECTRONIC GAMES); 1 WALKMAN IN USE; AND 1 CELLULAR PHONE IN USE. THE FLC ADVISED THE #1 FLT ATTENDANT TO RETURN TO THE CABIN AND SHUT DOWN THE CELLULAR PHONE. UPON RESLAVING OUR COMPASSES (RESLAVING OF COMPASSES WERE DONE 2 TIMES ON THE GND) AND ADVISING ZNY OF OUR NAV DIFFICULTIES; THE COMPASSES REALIGNED AND FLT PROCEEDED WITHOUT INCIDENT.