How accurate is the GPS track map?
The overall shape of the course is accurate, but differences in line may not be evident. As the constellation of satellites overhead changes, the track map will drift slightly. Due to these inherent limitations in GPS, it won’t reliably show you the difference between hitting the apex and missing it by a foot. However, with excellent satellite visibility (more than 8 satellites) and low HDOP values (under 1.2), you can potentially do line analysis.
