Bought 2 Garmin 106sv for the bow. One transducer on TM and the other for maps. It has Navionics maps on it. Mostly fish Ky and Barkley lakes that have fluctuating levels. Tried finding the offset level to adjust and have watched mult. Videos. Pretty simple process but on my units there is no water offset selection. I do not have a subscription to Navionics and was wondering if this was needed to access this and other features?
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