I have been changing depths in SC today. It seems most noticeable with a weak contact on DEMON. So, for the ones I have been looking at sphere seems to illustrate this pretty well. Remember that sphere in stock SC seemed to provide detection out 10,000yds. This was greatly toned down in SCX such that sphere was very limited to only close contacts leaving TA as your only real tool for ASW work. In stock SC, getting a master contact between TA and sphere was pretty easy and then your solutions were much more accurate with triangulating. (In stock, even without a track on the waterfall or NB lines in sphere, once you had a TA bearing, you could often attempt to designate in BB to pick the contact up on a sphere.)
Anyway, I have seen two moderate rightmost DEMON lines drop off DEMON going from 100' down to 1550' in the 688I. Before they drop off, rather than get very thin they begin to break up into bursts of signal and then quiet. Eric implies in his tutorial that this behavior is analogous to how detectable your sub will be from the other platform.
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