[Hylander_1314]

The mods are limited as to what you can use, since the 1.5 Uboat missions add on changed much of the game files and most mods available today are geared toward the 1.5 version of the game. Some mods can be used for older versions of the game, but you will have to try them, as it is hit and miss as to what will and won't work. If a mod makes the game crash, it isn't compatible, so you'll just have to see what will and won't work. But the 1.5 add on is dirt cheap these days, so if you run into too many issues, it isn't prohibitve to pick up as far as cost goes.