The model without the HD designation is the 2010 and older model of the 798.nlester wrote: One thing that I still don't understand. On the 798ci at 640 x 640 resolutions. There are some units listed as HD and some that don't indicate HD. I thought that the 640 x 640 resolution would be what made a unit HD or not. The 798ci units not listed as HD seem to be selling for just over $700. The units listed as HD seem to be listed for $850 to $1150.
What qualifies a sonar as HD?
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