its been a while since i used em but if i remember correctly they need to pass within 400m of the intended target to "lock on" or they just keep going straight so you need to aim them you just dont have to be all that accurate.
as mentioned they are pretty slow so only use them for merchants and they are best used in convoys to ensure it locks onto something.
i would use them in sonar guided aiming at convoys while dodging DD where i couldnt do any real aiming, fire and forget hoping to get lucky.
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