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Learning the HARD way...
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+1 on using Silicone to stick the transducer to the inside of the hull. This is exactly what I did with my O'day 35, when I mounted a Garmin Echo 200 to replace my ancient, and unreliable Signet unit. The old signet unit would frequently jump from 3' (which was impossible with a 5.7' draft) to 20'.

I can state that the Garmin echo reads fine up to 150' (which is far deeper than my keel:)), and may read deeper - I just haven't been in deeper water yet. It is far more interesting, and reliable, to constantly see fish pass under me, and watch the bottom contour than it was to see the digits (which may not be accurate) change.

The Garmin echo units retail from under $100 to about $400.
 
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