Absolutely spot on, as usual Len!
Always a pleasure to compare notes with a smart guy like yourself...
I am wondering since HB is still partnered with Navionics product and Navico already signed a deal with Garmin that JOI may have a 360 like device coming that no longer needs to be physically rotational; and it could "look" 360 degrees still.
I have SI on both ends of my rig and I am trolling sometimes as slow as .7-.8 MPH when it gets down in the lower 40's to 32ish degrees W. TMP. so when I have a bait 45-70 back, there's plenty of time for review.
Many of the break lines are pretty vicious for an inexperienced angler to run, since often I can have 10 FOW at the bow and 32 FOW off the back because the breeze is pushing me at a slight angle - and that's on a 17' craft.
Looking left I may be viewing a very steep decline and to my right it could be very abrupt to only a few feet before it's dirt.
This is a fairly old 800 kHz SI shot ( early season on a 998c HDSI) - but just to my left is 30 FOW and to the right you can see you're grounded in very large hunks of limestone, some as large as a Volkswagen Beetle. This is the channel to Lake Michigan, and not Muskegon Lake where I generally am once they've entered to winter over before the annual spring migration - just for a visual.
The range is in @ 60' L&R because I am a "prisoner" to the break lines, where the fish are choosing to herd bait and feed - for others they may want a larger range, for this technique I prefer the resolution over range.
The next few years are going to be very interesting, and YES we'll have to pay top dollar for the 'best you can get' - and that rule will remain a constant!!! LOL!
The guy that's not willing to lay out a substantial amount of coin for a setup will have to settle for the $199 they are willing to spend and a lot less features in the tool set.