When I had my 20 foot pontoon, I had one unit that pivoted to be seen from bow or helm. Was a simple down unit. Worked good for me when working jumps, or downpoling in creeks, or when throwing lures in the dark in Spring at Stripers working the bank.
I agree with all others, though, a 360 unit would tell you where they are after they go down better than a simple down unit. Even with knowing where they went after they went down from a surface feed, you'd have to be moving pretty fast to keep up with a roving school. My philosophy has been that if they are working a particular area, or a particular type bank, or channel break, or flats area, I don't much care where that last school went. I'm more interested in using the fishfinder to locate the bottom terrain, and getting a headsup when the next school shows up at that location.
I just never had much luck chasing fish, I have had a little luck (pic) finding a good area, good terrain, good pattern using a simple down unit. And then just giving it a little time for the dinner bell to ring. Pic shows the unit and how I had it mounted.
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