Id love something like this! I cant stand the 15 convoys that I meet every patorl or the fact I can sink upwards of 200K tons in one war patrol (2 yamatos + merchants
Interesting map I found(not sure what year this is but meh a good general idea of shipping lanes in the pacific):
http://tobi.gmu.edu/images/maps/01247.jpg
And heres a page filled with maps of the pacific theatre. Hope you can find at least one or two of them useful.