As far as Winnipesuakee is concerned, I have noticed no difference between the NT+ chip I used to own and the MAX chip I have now. The MAX chip I have is very handy on the ocean (it contains every chart from the Bay of Fundy to Barnegat Bay NJ) and also came with the NY State canal system, Lake George, Hudson River, Squam Lake, and quite a few other places.
MAX features like real time currents and such can be very handy in Portsmouth Harbor and at the mouth of the Merrimack River where conditions can get ugly during certain tide/wind/wave combinations.
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