Thanks for the answers so far, they’ve really helped. I have a couple more though:
1. How do ships spawn?
For example, I’m thinking about getting a type IX and going to the East coast of the US/Gulf of Mexico.
Will I encouter ships and convoys, or will I be outside of the spawn points zone?
2. Where can I find out how many depth charges ships have?
EDIT: And also, why the difference between “Merchant tonnage ” and “patrol tonnage”:
https://imgur.com/a/WwD2mCf