You can easily convert your 72MHz radio to 75MHz if you want to use it for subs.
32nd Parallel 1/12th scale U.S.S Holland
Scale Shipyard 1/48th scale Type IX
Alexander Engel 1/48th scale Gato
Graupner MC-19 radio converted to 75MHZ
"Anything one man can imagine, other men can make real." — Jules Verne