Let's do this for the Baltic:
1st September, 1939
1st September, 1940
7th December, 1941
The dates are in the upper-right corner, these are views from the Mission Editor, with 'Baltic.mis' loaded, the name in the upper-left. Each of the yellow squares are an RGG (Random Generated Group) that has the potential to spawn a "Group", which might consist of one ship, or a hundred ships (highly unlikely). In the Baltic, there are mostly "singles" and "doubles" in the groups. Note however, that there are multiple yellow squares in most of those locations, some do represent the "static" harbor vessels you saw. Notice also, that as the war "progresses", the traffic pattern will change. If you are late in the war, there is generally quite a bit less traffic - it has all been sunk! Be aware that there are mines in select locations, as well as airplane traffic and task force traffic not seen on this view. There is also a Russian submarine layer, though that only plays into a small segment of the area, and time frame...
Also, when you are reporting issues, if you would, please include what submarine you are in command of, where you have sailed from, and what the date is - thanks!
