I do not like map contacts enabled. You know where the targets are and can easily plot their courses and speeds. Try map contacts disabled with TMO and OTC. You have to plot the courses with sonar bearing readings, and then use OTC to plan an attack. Also, to find speed of the targets you have to stop your boat and then time the ship as it crosses the periscope bearings. It is time consuming and difficult. Also, you can skip OTC if you want to use O'Kane, but you still must calculate speed and course.
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