Get the HD ducer. If you haven't opened your ducer package that came with your unit you can send it to Humminbird fr an exchange for the HD ducer and you pay $90 extra and they ship you the ducer and you ship them your old ducer in exchange.
Or you can do what I did and buy the HD ducer out right and put the HD on the stern and the non HD on the TM. Just a suggestion if you already opened the standard ducer. The HD costs about $200.
The settings are the same. You just need to adjust your monitor settings to make it clear the way you want it.


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