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When that shallow you really have no need for zoom or dual beam transducer. You would be just fine with an entry level in whatever brand and save some $$. If you do want zoom, go with a marcum m1.
I have to respectfully disagree with some of this. There is a little more to it.I do most of my fishing in shallow water too. The issue I have with “entry level” flashers is the minimum depth setting is 20’. If you’re fishing shallow, say 5’, the entire water column will be squeezed between the 12 o-clock and 3 o-clock position. That leaves the other 75% of the display unused. The FL22 has a 10’ setting so the water column is more spread out on the display. Better resolution. When you’re fishing that shallow, a wide beam angle is nice because the cone doesn’t have much of a chance to open up. But, when your fishing that shallow, you’re usually fishing weeds.... it’s nice to tighten the beam up and clean up the display. Dual beam or Tri beam is nice for this. The entry level flashers also lack a low power mode. The FL22 has a low power mode. That really helps when your fishing shallow.Over the years, I’ve owned/fished just about every Vexilar flasher. A few years back I picked up a couple FL22’s. I liked them but kept having issues with the Tri-beam transducers. Vexilar kept replacing them, the issues continued. You could probably look back at some of my old posts if you’re interested in the issues. I sold them and moved on. Shortly after that, they discountinued the 22. I think I heard they put it back in the lineup. May be wrong though. I currently use an FLX28 and an Ice55.
22 can be bought & they have a new tri beam that fixed all the issues works great. I run an FL18, FL20, FL22HD, and a FLX28 Double vision. All tribeams.
I can't speak from much experience but I do know the garmin sonars have a fully adjustable 16-24 degree beam, with 24 being the widest Ive seen yet. I would think hat beam width would be good for the shallows. Gt8if is the ducer and either the striker or echomaps have a flasher mode.