There are a few factors that make the tma on the ffg a disaster.
If you do it manually, you'd better be doing it on a contact within 5nm, or you'll have to "imagine" the lines being longer, which is easy to miss. And if the contact is actually further away than the max the map can display, you can give up on it already.
If you put it on auto, you'd damn better remember to turn it off before using active sonar, or any data you get from it will get discarded and hidden as far as the contact data goes.
There is one mitigating factor against this disaster: Radar contacts are positioned as detected. If you're using that radar in the first place, that is...
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