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The DST800 you bought will send depth information to the 740S. So if all you want to display is the depth of the water it will work. However, it won't connect to the Sounder port on the 740S or allow the 740S to display the fishfinder screen. If you want to display that information you will need a different transducer.

Personally, I bought a cheap (~$60) garmin transducer to connect to my 740 specifically so I can 'see' the bottom. Mine is a 'transom mount' however I expect it will work just fine to shoot through my epoxy hull. I haven't connected it (no time to run the cable under cabin sole, etc.) so I can't verify that, but I did the same thing with my O'day and it worked very well.

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