Quote Originally Posted by Moveon View Post
one part of the screen shows a depth of 19.4 ft and below that number is the 22.1 ft depth. which depth reading is the real depth under the boat. that confuses me.



QUOTE=rnvinc;3687678]Correct ... Targets directly under the boat will show in both left SI and right SI ...

Distance to targets in SI (out to the side) is calculated as "slant range" to targets ... (that geometry Pythagorean thing) ...
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Right Triangle Calculator with detailed explanation

Rickie
[/QUOTE]

My apologies ...

I see I answered his question kinda using the wrong digital depth ... (I didn't notice his cursor was active) ...

The actual depth at the boat is 19.4 as indicated at the top left of the screen ...

The water depth at the active cursor is 22.4 ...

Rickie