I purchased a Garmin 536 last year with the Bizer map and I am really happly with that setup. I have never used the Standard Horizon GPS so I can not comment on it.
I have also tried using the Garmin map for Winni and I find the Bizer map for the GPS to be much better.
I can tell you that the GPS saved me lots of times from getting into a rocky area or being on the wrong side of a marker.
Last year was my first year on Winnipesaukee and I would still not go far from my camp without a GPS. Not so much as I dont know where I am as that I like having the GPS map right in front of me showing me where the next marker is and where the navigation lanes are.
One more thought, I still carry a paper chart just in case the GPS goes on the blink.
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