SHALLOW TURN COMBINED WITH STRONG WINDS CONTRIBUTED TO ACFT ENTERING WARNING AREA. ATC INTERVENED; CORRECTED ACFT COURSE.

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B727 FLT FROM BWI-BDA WITH FO FLYING. FLT IN MODERATE TURB IN COASTLINE AREA JUST EAST OF SIE; WHILE TRANSITIONING FROM PALEO DEP (BWI) TO RTE B24; JUST PASSED OVERHEAD SIE FOR OMEGA POS ACCURACY CHK; CLBING THROUGH FL 290 FOR FL330 TURNING FROM 96 DEGS INBOUND TO 131 DEGS OUTBOUND HDG FOR OUTBOUND B24; ATC CALLED AND STATED WE WERE ENTERING WARNING AREA 107.A AND TURN R 15 DEGS TO REJOIN B24. AT THAT TIME WE HAD A 151 DEG HDG (20 DEG CRAB ANGLE). THE FO TURNED TO ABOUT 165 DEGS TO REJOIN. WE HAD FULL DEFLECTION ON THE CDI; SET TO 131 DEG. THE DME WAS 20 DEG E OF SIE. THE FO STATED HE WAS USING THE RMI TO JOIN THE AIRWAY. HE THEN TURNED ANOTHER 20 DEGS TO THE R TO JOIN. I CHKED THE OMEGA WIND - 210 DEG AT 122 KTS. OUR CLB SPD WAS 220 KTS FOR THE TURB AND BANK WAS LIMITED TO 15 DEGS FOR SAME. OMEGA SHOWED MAX XTK (CROSS TRACK OFF COURSE ERROR) OF 6.5 NM. AT FISSH INTXN (SIE 131/23) THE WARNING AREA APPEARS TO BE WITHIN 8 MI OF AIRWAY. ON RETURN FLT INBOUND ON B24 E OF SIE IT WAS NOTICED THAT THE RMI (VOR) NEEDLES DEFERRED BY 10-12 DEGS (#2 SUSPECTED TO BE IN ERROR) ALL OF THIS ADDED UP TO ATC'S RADAR SHOWING; ACFT IN WARNING AREA; CARE MUST BE TAKEN TO INSURE CORRECT COURSE (TRACK) WITH CHANGING WINDS (TURB AND STRONG XWIND) AND BOTH PLTS AND ENGINEER MONITOR OUTBOUND TRACK OVER FIXES TO INSURE CORRECT NAV. I WAS CHKING OMEGA COORDINATES FOR NEXT FIX AND MONITORING RADIO; ETC DURING OFF COURSE CORRECTION. I ASSUMED FO WOULD FLY PRESCRIBED COURSE AND USE HIS CDI AS PRIMARY NOT HIS RMI. WE BOTH WATCHED THE OTHER AND CONFIRMED THE OUTBOUND AND INBOUND MORE CLOSELY AFTER THIS.