you have to be at 34.5 feet to a full surface for a start
to send a contact report and your crew must have at least 2 escorts, if they have them, and 3 of the main ships in the convoy or task force in sight to send a contact report. Then you will get a message back telling you your orders after a few minutes where you should be headint to pariscope depth incase of message intercept where planes and DD's might come looking for you.
You can only send 1 message per contact unless it is hours later after tracking them and reloading torpedo's.
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