Radio Contacts
There are two types of radio contacts. Ones that are within 300km which are usually single ships, sometimes two ships. And ones that are within 1500km which are convoys, task forces or warships.
The close single ship contacts can generally be reached within a few hours at maximum speed and are fairly easy to locate. The convoys which are usually further away can be a lttle tricky to locate because they may chage direction while the single ship contacts generally do not. Plot an intercept coarse based on contact's speed and direction, then begin looking out for them when you get within visual or hydrophone distance.
I hope this explanation is what you were looking for.
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