if you are in a high contact environment rotate your trackers every 3 minutes or so until you locate a contact of interest. That way you have half a dot stack to work with rather than none on some and all on others.
If its a situation where there are many ships in a group assign trackers to all ending in the contacts you want to track so all contacts are available on the tma screen, then extrapolate the range and course from the contacts you are tracking. Check the sonar for the current bearing. Basically do TMA without the LOBs.
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