I will chase it if I can reach the stated course line, BEFORE he moves 170 km. In other words, the intercept point must be within 170 km from the icon location. At that distance the target's possible locations start to fall outside of your hydrophone detection range. Any further and they might slip by unnoticed at the extreme hydrophone range. You do need to use the hydrophone manually though, to listen upto 34 km. Don't leave it up to the crew to report them.
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