If you have 15 Patrol Zones you're good:
Aleutian Islands
Caroline islands
Formosa
Indochina
Java Sea
Malaysia
Northern Japan
Northern Mariana Islands
Palau Islands
Philippine Sea
Solomon Islands
South China Sea
Southern Japan
Sulu Sea
Yellow Sea
If you need JPG maps with the routes of merchant shipping and Task Forces, I can do some digging and shoot you a link or a file.
Happy Hunting!