You dident mention whom 'gave notice' that a ship was approaching.
Sometimes these contact reports are estimations provided by comsubpac.
They are just that... estimations. Also last known positions. Ships continue to move "away" from that position so some guess work is involved in planning an intercept. Sonar is of great use here as you can hear a hell of a lot further than you can see.
But you should know all that being a vetran of SH3.
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