Charting the New Hampshire Lakes since 1967®
Central Lakes Region | Lake Winnipesaukee | Winnisquam Lake | Newfound Lake | Ossipee Lake | Squam Lake | Lake Sunapee
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Frequently asked questions

• What do all the various buoys tell me?


• I have a question concerning the marker on the South side of Ragged Island...


• I bought a Bizer chart, but I've searched all over it and I can't find sources for their data. I'm thinking of going to your chart. Do you have sources for your data?


• Do Bizer and/or Duncan Press have Barbers Pole, Nipple Rock, and Hole in the Wall on them?


• Map competitor Bizer says there is no difference between navigating on the lakes and navigating on the oceans? Is there?


• Why don't your charts have precise buoy projections?


• "Bizer continues to have the most accurate depth information of Lake Winnipesaukee and Lake Winnisquam....This feature is not on any other chart of these lakes." True?


• "Bizer features the only chart of these lakes that has accurate latitude and longitude grid markings..." True?


• "U.S. Geological Survey map accuracy standards are that 90% of all data points be within 0.5 mm (1/50 inch) of their true scale location. Only Bizer meets those standards." True?


• Buoys and their Numbers


• How do I decide whether to buy the green chart by Duncan Press or a competitor's map?


• Why isn't the "new" Duncan Press chart the same as the "Old Green Map?"


• Why aren't the buoy's positions on the chart accurate?


• Why isn't the "new" Duncan Press chart the same SIZE as the "Old Green Map?" Why is it so much bigger?


• I'm confused. Why aren't the numbers on the actual buoys on the lake?


• I miss the depths on the Old Green Map. Why did you change them?


• I was disappointed to find that (the Bizer chart) . . . did not have Lat and Lon scales on the borders . . . Does your paper map of the lake have this detail?


• What's all this flap about "accuracy?" Should I care?


• What is metadata, and why should I care?


• Can I use my GPS (Global Positioning System) equipment with your charts?


• Why do you show depth contours on your charts?


• How exact are the depth contours?


• Does your chart show all the rocks in the Lake?


• Why don't your charts use a Mercator projection?