Look for the Garmin Echomap Plus 64CV. The 63 series is with freshwater maps. The 64 is for saltwater maps.
https://www.westmarine.com/buy/garmi...arts--19386556
Was $399 over memorial day. Like it much better then my Lowrance Hook.
Can't comment on the Echomap Plus UHD as that series of transducers appear to be geared more for shallow freshwater use. Go to the Garmin website and review the transducers described application.
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