If you really want to see all the "Enemy Traffic" in GWX then the mod you should download is SH3 Generator.
This is a little external program which will rewrite your in game captains log book and fill it full of good intel, on whats where and when. It will also place most of this intel on your F5 nav map. I never sail without it. I got it here...
www.global-explorer.de/sh3gen_v082.exe