And why is the TD not mounted on the transom?
That is a fairly old black and white unit, but I have installed quite a few of them and never had an interference prob with them
Small size screen HB Helix is good unit and deal.
Mid size screens garmin 74sv and 94sv are really goodbang for the buck.
HB Onix too
Lowrance HDS are solid as well as the HB x99 series.
I just ordered a Garmin 7608xsv. I think Garmin and the HB Onix have best and newest technology
I made a map of my 350 acre lake I made with my HB 898ci si. Took me two months and a ton of gas. 3 mph was max speed. I used a timer and made 15 min recordings.
I used Dr Depth software (had to buy). Worked well but contour lines are not very close to show alot of detail.
I had them made on 11 x 17 paper (two sided) and laminated. I have sold a bunch for $12.
Here is the map.
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