Bizer has been the go-to for a long time, but I don't think most modern MFD's support their electronic charts.
I would suggest a 9" Raymarine Axiom, along with a Navionics chart. You can go to the Navionics web page and see the level of detail they have for Winnipesaukee, and I think you'll find it more than sufficient.
You could go with even a 7" Axiom, but they are a tad small, IMO.
The Raymarine MFDs are more responsive than the standard Garmin units (plus they are based in NH).
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