speedometer vs. GPS

BroadHopper · 02-14-2011, 09:16 PM

I was driving the ol' Jeep down 89 from Burlington VT Friday. It was fairly straight stretch in Andover, NH. With the cruise control set at 74 on my Garmin NUVI 225, the Jeep speedometer says 77,78 mph. Local Andover cruiser stopped me and clocked me at 82 mph! So the GPS was off 8 mph!

Garmin claims .1 mph accuracy. I was traveling in a straight line. I'm wondering if the radar could be inaccurate. It was an one of those dashboard mounted units and he was parked in the median.

I wonder how they check the accuracy of police radar as I am sceptical of an 8 mph difference. How would you know if the LEO is telling the truth?

02-14-2011, 09:16 PM	#11
BroadHopper Senior Member Join Date: Oct 2004 Location: Laconia NH Posts: 5,582 Thanks: 3,224 Thanked 1,106 Times in 796 Posts	Ticket on 89 I was driving the ol' Jeep down 89 from Burlington VT Friday. It was fairly straight stretch in Andover, NH. With the cruise control set at 74 on my Garmin NUVI 225, the Jeep speedometer says 77,78 mph. Local Andover cruiser stopped me and clocked me at 82 mph! So the GPS was off 8 mph! Garmin claims .1 mph accuracy. I was traveling in a straight line. I'm wondering if the radar could be inaccurate. It was an one of those dashboard mounted units and he was parked in the median. I wonder how they check the accuracy of police radar as I am sceptical of an 8 mph difference. How would you know if the LEO is telling the truth? __________________ Someday may never be an actual day.

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