You could also do regions of the ocean where there were intense naval battles, that could help fill some of that massive space. Or just have regions covered by Fleets.
US First Pacific Fleet
US Second Pacific Fleet
US Marine Forward deployment Fleet
Imperial Japanese Naval Northern Force
Imperial Japanese Naval Forward deployed Force
Imperial Japanese Naval Carrier Group 1
Imperial Japanese Naval Carrier Group 2
etc, some research to nail down the names. Or you could divide fleets by Admirals in the war.
US: Nimitz Fleet, Fletcher Fleet, Spruance Fleet
Japan: Isoroku Yamamoto Fleet, Chuichi Nagumo Fleet, Nobutake Kondo Fleet
Fun fact - all 6 of those admirals faced off at the battle of Midway.
You could also do regions of the ocean where there were intense naval battles, that could help fill some of that massive space. Or just have regions covered by Fleets.
US First Pacific Fleet
US Second Pacific Fleet
US Marine Forward deployment Fleet
Imperial Japanese Naval Northern Force
Imperial Japanese Naval Forward deployed Force
Imperial Japanese Naval Carrier Group 1
Imperial Japanese Naval Carrier Group 2
etc, some research to nail down the names. Or you could divide fleets by Admirals in the war.
US: Nimitz Fleet, Fletcher Fleet, Spruance Fleet
Japan: Isoroku Yamamoto Fleet, Chuichi Nagumo Fleet, Nobutake Kondo Fleet
Fun fact - all 6 of those admirals faced off at the battle of Midway.