[Sailor Steve]

Real Fleet Boat: Literally realistic. Escorts behave as they really did, which is good but can be predictable.

Trigger Maru Overhauled: Tougher than real life, but makes it so you can't predict what they're doing. While it's technically less realistic, it forces the player to behave in a more realistic manner, i.e. being more cautious than the average gamer.

Run Silent Run Deep Campaign: An add-on campaign that works with other supermods. It recreates historical Japanese ship movements, so targets are much harder to find.

Fall Of The Rising Sun: A development of TMO. Adds more ships and makes the gameplay a little easier.

Game Fixes Only: Doesn't add much to the game, but fixes most of the bugs, making a stock version that actually works properly.

There are many more 'small' mods that work with most of the supermods. Which ones you choose are strictly personal.