Both the 570 (2d) and the 570 DI (2d/DI) would be good for the depths that you mention...
Some find 2d sufficient.. Some like this new DI technology... Some like both...
I would recommend saving just a little more and investing in a unit that has GPS Chartplotting built in ...
Being able to save waypoints right on the sonar unit is very handy...
The 581i combo is not that much higher....it is 2d with GPS...
Rickie


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