Will forward this here from the previous thread:
Dad was a V-12A Naval Aviator (Marine), who graduated at the very end of WWII/VJ as a Corsair Pilot.
On land, it was low-frequency radio range.
Around the boat, it was YE-ZB, pre-flight course plotting, and dead reckoning.
[EDIT]
YE-ZB.pdf
YE-ZB Presentation
Bowie