The radio reports ( which give you the map update and symbol ) come from the lead unit
If its a sub its round
A merchant and shows as a convoy
A warship and shows as a TF
The Sub wont necessarily be in the middle of the convoy as its classed as a warship so will usually be in one of the outer rows
AI subs tend to run a little slower than the speed they are given so by the time you get to the convoy the sub will have dropped back slightly
Or be dead lol
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