Accuracy of the

With range being calculated using the time taken for the signal to travel between the satellite and the receiver, any variation in the speed of the signal and the actual path followed will lead to errors.

Errors due to these effects will normally amount to no more than ±15 metres for 95% of the time, being made up from the following:

• ionospheric effects, ±10 metres;

With my boat moored in the marina, normal GPS errors were plotted as shown over an 8 hour period. Although most were contained within the 25 metre diameter circle, one was almost 100 metres in error. This is perfectly normal GPS performance.

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