A B737-300 CAPT RPTED THAT THE 10-9 ARPT CHART FOR BWI INADEQUATELY DEPICTS AN AREA OF PARKED ACFT BTWN TERMINAL C AND THE ISLAND.

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LAST DAY OF 4 DAY; END OF 8 HR DUTY DAY; SIGNIFICANT WX ENRTE. LANDED ON RWY 10 AT BWI. L OFF OF RWY 4; CONTACTED GND. TOLD TO TAXI TO PARKING. REFERRING TO 10-9; IT LOOKED LIKE BTWN TERMINAL C AND THE ISLAND WAS BEST RTE. DID NOT SEE THE NOTE SAYING THAT AREA IS FOR PARKED ACFT. NO TAXIING. (IT SEEMS LIKE SOME KIND OF HASHES IN THERE MIGHT PREVENT FUTURE CREWS FROM MAKING THE SAME MOVE.) GND CALLED A COMPANY FLT; BUT IN FACT WAS CALLING US. WE WERE THROUGH THE AREA BEFORE CONFUSION WITH GND AND CALL SIGN WERE SORTED OUT. CONTRIBUTING: 1) I DIDN'T READ THE 10-9 PAGE AS THOROUGHLY AS I SHOULD HAVE; WAS MORE CONCERNED WITH NIGHT APCH WITH TSTMS IN AREA. 2) BOTH CAPT AND FO FIRST MONTH IN BALTIMORE. NOT ENOUGH TIME TO GET A HOME TOWN FAMILIARITY. 3) ONCE WE TURNED L INTO THE FORBIDDEN AREA; THERE WAS NO LONGER A YELLOW TAXI LINE TO FOLLOW AND I SHOULD HAVE BEEN MORE HEADS UP ABOUT OUR SIT. I WAS CONCERNED WITH R WINGTIP CLRNC AND CAPT WAS WATCHING L WINGTIP. (PARKED ACFT ON R AND FUEL TRUCKS ON L.) 4) I WOULD HAVE CALLED US OFF TAXI LINE (AS PER FOM); BUT LET MY ATTN BE DIVERTED TO CLRING WINGTIP (PROC DEV). IN SUMMARY; NOT BEING AS FAMILIAR AS WE SHOULD'VE BEEN. WE SHOULD HAVE BEEN MORE CAREFUL OF OUR CHOSEN RTE. ONCE OFF THE CORRECT RTE; WE BECAME MORE CONCERNED WITH TAXIING THROUGH SAFELY. NO CONTACT; NO DAMAGE; WE WERE LUCKY. PRINT REMARKS; HASHES IN THAT AREA SINCE WE SHOULDN'T TAXI THERE.