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Slickcraft · 08-31-2009, 04:18 PM

My Garmin GPS steady state speed accuracy is 0.05 meters/sec or 0.1 mph. Position data is updated once per second. I might accept the GPS reading over the speedo.

While there are position errors in GPS, those errors change slow relative to the once per second update rate so distance traveled in one second is very accurate.

08-31-2009, 04:18 PM	#14
Slickcraft Senior Member Join Date: Mar 2008 Location: Welch Island and West Alton Posts: 3,219 Thanks: 1,175 Thanked 2,002 Times in 915 Posts	0.1 mph My Garmin GPS steady state speed accuracy is 0.05 meters/sec or 0.1 mph. Position data is updated once per second. I might accept the GPS reading over the speedo. While there are position errors in GPS, those errors change slow relative to the once per second update rate so distance traveled in one second is very accurate.