Some suggestions
 

Amazing game

1. Enigma machine and Morse code are amazing but serve little purpose, it would be great if you could find some uses for them. Perhaps decode the mission objectives or convoy information which once known we can time compress to the patrol area. Or send patrol reports to bdu

2. More records for the player

3. Forward torpedo room and damage control

4. A captains log book for our patrols that are friends can see

More stuff to mess up
 

Don't forget this is an online game, with no saves.

The more gadgets to learn about, the longer the time before we can be successful.

I can't see people playing for more than an afternoon or evening.

Do the missions have a time limit? Are there targets after that first convoy or is it a one attack mission?