You have to be familiar with the area before you go. also you do need to make more passes in shallow areas. Also speed plays a difference in the recordings. in the pics below you can see red line is sonar returns. to the left i was going about 20 mph then slowed down to Idle speed. the red dots indicate sonar returns. Notice how they are spread out then, once I slow down you get more returns per foot.
Second Pic shows 31mph, i am getting a return every 11 ft max +/-
if I see a blip, i will go back and map the area in detail at idle speed to get the most information.
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