PAX USE OF ELECTRONIC DEVICES CAUSE COMPASS ERROR WHICH; IN TURN; CAUSES NAV ERROR.

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WHILE TRACKING THE CTRLINE OF J-44 ENRTE TO MCCOOK VOR; ZDV CALLED AND GAVE US A VECTOR HDG 10 DEGS TO THE L BECAUSE WE WERE 7 NM S OF THE AIRWAY. A QUICK CHK OF THE COCKPIT INSTS REVEALED THAT THE #1 COMPASS WAS 10 TO 15 DEGS IN ERROR. SEVERAL ATTEMPTS WERE MADE TO REALIGN THE COMPASS WITH NO SUCCESS. I THEN ASKED THE FIRST FLT ATTENDANT TO CHK THE PAX CABIN FOR PAX OPERATED ELECTRONIC DEVICES. SHE RPTED THAT A LAPTOP COMPUTER WITH AN EXTERNAL BATTERY PACK WAS IN OP OVER THE R WING. PLUS A VIDEO GAME AND A CALCULATOR IN OP IN OTHER PARTS OF THE CABIN. I THEN ASKED THE PAX TO SECURE ALL ELECTRONIC EQUIP VIA A PA ANNOUNCEMENT. AFTER ALL ELECTRONIC EQUIP WAS TURNED OFF; THE #1 COMPASS RETURNED TO NORMAL OP AND REMAINED NORMAL FOR THE REMAINDER OF THE FLT. I BELIEVE THAT THE PAX OPERATED ELECTRONIC DEVICES WERE ADVERSELY DISRUPTING THE NAV EQUIP OF THE ACFT. I RESPECTFULLY SUGGEST THAT THE RECOMMENDATIONS CONTAINED IN THE FAA ADVISORY CIRCULAR LETTER 91-21 CONCERNING PAX OPERATED ELECTRONIC DEVICES IN ACFT BE IMPLEMENTED ON MY AIRLINE AS SOON AS POSSIBLE.