I'm new to the game, and have only gotten to early 1940. When is that minefield in place? Is the area between the black filled with mines, or just the black lines themselves? How do the Brits avoid their own mines?
Personally, I love hunting the North Sea with my Type VII. I know that deep water is your friend, but at this stage in the game it's not as critical as it will be later, so I'm taking advantage of the shallow-water targets and poor cover while I can.
Any advice on mines and minefields would be appreciated. On the plus side, I did recently (1939) make a night surface run through the Dover Straights, got attacked by a small patrol ship and something bigger, gunned the patrol ship (it withdrew) and outran/lost the bigger ship. Then I blasted a trio of big Frenchie merchants. Good times!