It can't be different colours, just because the sonar computer does not know that these are 2 contacts. NB even does not know that different freuquencies are part of the same contact (while DW always knows which lines are of the same contact).
All I would like is that filtered singatures would include all signatures which could match. Now when actual signature has more lines then library singature, the library signature is rejected. Which happens when you have 2 contacts on same bearing.
So if library signature has 4 lines and all are available on actual NB bearing, even if there are 4 or 20 more, the signature should be available for clasification (it is not now).
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