@Belial91
I wonder why you have the "Merged Campaign" Mod enabled. This mod will not add extra traffic to the North Sea or the Atlantic and it is not as if you are going to cross the Indian Ocean to reach Jakarta, either.
If I were you, I would disable all mods and I would start a new campaign. If the game continued to crash then I would assume that something went wrong during the installation of GWX or SHIII itself - the problem would probably be in the installation of SHIII. In that case, I would uninstall SHIII and reinstall it. This time you might want to consider to use MultiSH3, a utility that allows you to have multiple installations of SHIII on your disk. This way you can keep a clean and working version of SHIII and also any other heavily modified version of the game, such as SHIII with GWX + mods, SHIII with NYGM + mods etc.
Are you playing the game on a Win7 machine? Is your SHIII copy free of Starforce?