Thanks, that's a big help. Naturally, I have more questions now.
8. Does playing with a higher reality factor (29% or whatever) increase my renown score?
9. Is there any advantage or disadvantage to having the periscope(s) up while I'm surfaced? Will I spot ships more easily? Will they spot me?
10. What is the dashed circle drawn around identified boats in the map/chart (F5) view?