You usually get NB first. So mark it. Mark the lowest frequency because it is the one which has the longest range. Also check the frequency .. most Russian platforms have it 50Hz .. American platforms have it 60Hz.
Mark other frequencies only if there are many targets on the same bearing and you have to pick some unusual frequency.
But as soon as you can mark BB, do so, because that allows you to use DEMON.
As for resolving ambiguity it never work for me on sub anyway.
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