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post #18 of Old 02-02-2011
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Chartplotter vs Mapping GPS

Is there a difference between a Chartplotter and a Mapping GPS? Is there a difference in the information that they provide?

I've experienced what others have noted: It's the maps/charts that are loaded into the GPS that lack accuracy and not the Lat/Long the GPS is providing. Someone once told me many charts outside of US waters were originally made just after WWII... and have never been updated!

However, I did use a Mapping GPS for primary navigation (no boat instrument at the time) sailing from San Diego into San Francisco. We made port late each evening, stayed within 5 miles of shore, and did NOT have any navigational problems... Until, in the Suisun Slough, the GPS had us crossing land .

Like anything else, navigation by GPS requires some common sense. Oh, and actually believing what your eyes are telling you when you're NOT fixated on the tiny screen .

J/36 "Zero Tolerance"
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