Quote Originally Posted by wakina View Post
I think the 1.7ft would be below the transducer and not the actual water depth which would be more depending on the location of the transducer
On the Lowrance HDS units there is an area in the settings that allows you to compensate for the location of the transducer.You can either compensate up to the water line [positive number] or down to lowest point on boat [negative]
I have mine offset to the surface. I'm sure other units have this option if you dig through the manual

Its winter,what else do you have to do?
[only time I read the manuals,]
page 81

http://www.lowrance.com/Root/Lowranc...0041-001_w.pdf