Some of the mods have add-in maps found throughout the submarine. I thought I had a copy of the one from TMO and FotRSU, but I cannot find it, and cannot remember its name to search on it... but there are a lot of variants of this:
The pic that KaleunMarco has above is the SH4MissionEditor with a Convoys layer from the game loaded.
Woah!!! that pic is BIG!!!