I would go with the Game Fixes Only Mod. It fixes many of the stock bugs.
Here
From that thread. Also see a JSGME Guide below my signature.
The "Game Fixes Only Mod" is comprised of a collection of stand alone fixes and mods that were made by the modding
community for use with the stock silent hunter 4 UBM v1.5 game.
Always install the "Game Fixes Only Mod" first and then add any other mods you want to try using on top of it.