DEV FROM CLRNC RTE -- WRONG NAV RADIO FREQ.

Narrative

I WAS ACTING AS SO ON OUR AIRLINE FLT FROM NEWARK; NJ; TO MONTEGO BAY; JAMAICA; ON FEB/XX/95. WE DEPARTED EWR (NEWARK) AT AM10 LCL TIME AND WERE FLYING THE PUBLISHED SID. THE DEP RWY WAS RWY 22R. WE WERE SUBSEQUENTLY CLRED DIRECT TO COYLE VOR. THE CAPT AND FO SELECTED A NEW FREQ IN THE NAV RADIOS AND TURNED R TO A HDG OF APPROX 300 DEGS. WITHIN A MIN OR SO; THE DEP CTLR ASKED IF WE WERE PROCEEDING DIRECT TO COYLE. WHEN HE WAS TOLD THAT WE WERE; HE ASKED US TO FLY 210 DEGS FOR DIRECT COYLE. THE CAPT AND FO THEN RECHKED THEIR CHARTS AND DISCOVERED THEY HAD TUNED THE WRONG VOR FREQ. THE CONTRIBUTING FACTORS WERE: 1) POOR COCKPIT DISCIPLINE. THIS IS A COMMON PROB AT OUR AIRLINE; AND IN MY OPINION; IS LARGELY THE RESULT OF ON-GOING TENSIONS BTWN COMPANY MGMNT AND THE PLTS. 2) 1 PLT (EITHER THE CAPT OR FO; I DON'T RECALL WHICH) LOOKED UP THE VOR FREQ ON THE CHART AND TUNED BOTH NAV RADIOS. THIS RESULTED IN NO VERIFICATION; OR XCHK THAT THE PROPER FREQ HAD BEEN SELECTED. 3) THE SO AT OUR AIRLINE AS AT MOST AIRLINES; IS NOT PROVIDED WITH NAV CHARTS AND IS NOT NORMALLY INVOLVED IN NAV DUTIES. HE; THEREFORE; HAS NO REASONABLE MEANS OF KNOWING WHEN A NAV ERROR IS BEING COMMITTED. THIS LARGELY DEFEATS THE PURPOSE OF A 3 PLT CREW.