i started the game with a tambor, then it was replaced with a porpoise after nearly getting sunk. now ive been given a gato. i started my career in 1941 so surface radar wasnt even available when i had the tambor and the porpoise. but now that ive got the gato there is SJ surface radar and SJ-1 surface radar available for upgrades.
sadly though, when i try to grab either one it says the upgrade pack cant be used on my sub
is there other radar packages available in teh future? i was sure the gato had surface radar in my old sub school missions