Like Jim said, they dont spawn if you're close.
But what if they reach their waypoint while you still have them in sight?
I had a strange experience a few months ago which i believe it has something to do with the waypoints.
I was just south of Ireland and i spotted a convoy.
It was morning, the convoy was heading towards me with 8knots so i decided to go to 50m and then periscope depth for the attack.
And i wait and wait and wait and wait. The hydrophone line was always drawn on the map. Until i got bored and surfaced. The convoy was sitting a few kilometers away from me, motionless in a perfect "Convoy" formation.
I approached, sunk one or two of them but still they were reported us unsunk on the map. Just a line at the sinking position and nothing more.
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