There are CRIPPLING penalties to staying at sea for too long. The only time you are offered upgrades to your boat and crew members get medals is in port after ending a cruise. So if you want to pilot an S-boat with no radar in 1945, just stay at sea all the time refitting and never ending your cruise.
If you want upgrades, new boats, increased crew proficiency and the like the way to do it is complete your mission then promptly return to port and end your cruise.
Completing missions and ending cruises is the only way you progress in SH4.
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