What I tell everyone to get:*copies/pastes*
Torpedo Damage Final version 2 mod that makes ships look like this:
Get it here
http://hosted.filefront.com/OceanBlue
For a supermod, GWX.
If you want to install the GWX Mod (and who wouldn't want that ?), don't install the one that Gameshadow has. They have an older version than what's current. Get the latest version here:
http://gwx.mysite.orange.co.uk/
I also suggest getting the RealweatherFix2 Mod that seems to help a little with "weather issues" the game gets (Make sure to follow the instructions before installing it)
http://hosted.filefront.com/TeddyBar/
Also, Don't ship out without Silent Hunter III Commander (If you use GWX, make sure you read the manual part pertaining to SHIII Commander)
http://www.users.on.net/~jscones/software/products.html
A lot of people like the Depth Charge Shake mod. I don't have the link for that handy. I don't use it because it tends to make me seasick but give it a shot and see if you like it.
I suggest updating the game to version 1.4 and playing it stock without mods for a little while first so you can REALLY see the difference that these mods and addons make but keep these links handy !!