"worldmap not available"

ok this is what i did: i undat the arcanum.dat file and put a couple weapons in the crash site cave then saved it as a different mod (arcanummod1). when i head southeast to leave the crash site and virgil suggests i use the worldmap. so when i do, it freezes up. also when i try to access the worldmap before virgil suggests it, it says "worldmap not available" so my question is... how do i fix this? or if it can't be fixed, what is another way i can put the weapons in the cave so i can use it in the game?