Why buy a FL-22HD over an earlier model?
The FL-22HD is exactly what it says in the name HIGH DEFINITION! Under 20 feet you will have better target separation than any other unit previous to the FL-22HD. It made specifically for the shallow water anglers. Aside from the FL-18 it is the only other flasher that the Bottom Lock feature which is great if you plan on using it on your boat.
Why does the FL-22HD only go to a maximum of 60 feet?
90% of the ice fishing population fish under 60 feet. Rather than wasting options that aren't used, we fine-tuned the range scale for maximum viewing possibility for that 90%.