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How accurate is the GPS info?

GPS accuracy depends on several factors. Today's GPS receivers are extremely accurate, thanks to their parallel multi-channel design. Certain atmospheric factors and other sources of error can affect the accuracy of GPS receivers. According to Garmin, their GPS receivers are accurate to within 15 meters (49 feet) 95% of the time. Generally, users will see accuracy within 5 to 10 meters (16 to 33 feet) under normal conditions. So no commercial GPS will pinpoint you precisely on to a specific point however, with the GPS info on the Lake Maps and your GPS it should put you within a cast away of where you want to be.

What things can cause GPS signal errors?

Factors that can degrade the GPS signal, and thus affect accuracy, include the following:

  • Ionosphere and troposphere delays - The GPS signal slows as it passes through the atmosphere.
  • Signal multipath - The GPS signal is reflected off objects such as tall buildings or large rock surfaces before it reaches the receiver.
  • Orbital errors - Also known as ephemeris errors, these are inaccuracies of the satellite's reported location.
  • Poor satellite visibility - The more satellites a GPS receiver can "see", the better the accuracy. GPS units typically will not work indoors, underwater, or underground.
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