Is speedo more accurate than GPS
10-05-2008, 05:55 AM
Join Date: May 2005
Location: Long Island
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Is speedo more accurate than GPS
I notice my zumo is always a few mph less than the speedo.
10-05-2008, 05:59 AM
Join Date: Nov 2005
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The speedos are always off by a few mph, I think they read high but the gps should be pretty accurate.
10-05-2008, 06:10 AM
Join Date: Jul 2008
Location: Deep Inna Heart of Bama
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GPS speed is very accurate
10-05-2008, 06:10 AM
Join Date: Sep 2006
Location: Atlanta
Posts: 2,380
Yep. Consensus around here is that the GPS is more accurate and that the variance between the Zumo and the HD speedometer is about 3mph.
10-05-2008, 06:14 AM
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10-05-2008, 06:18 AM
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Every bike I've ever had read a bit higher than my GPS.
10-05-2008, 06:29 AM
Join Date: Apr 2007
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also 3 miles an hour off according to my garmin.
10-05-2008, 06:39 AM
Join Date: Jun 2007
Location: N. Alabama
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GPS is much more accurate. Take the GPS and a stop watch and then set your cruise on an interstate with mile markers. Divide the number of seconds into 3600 and get your MPH. It is better to have a long run to compare your odometer to the mile markers and the GPS.
10-05-2008, 09:31 AM
Join Date: Oct 2006
Location: Retired and living in the mountains of NE PA
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We tested several GPS units with radar. Their speed readings were spot on accurate.
10-05-2008, 09:36 AM
Join Date: Jul 2007
Location: SW Minnesota
Posts: 6,336
Dakota Digital sells a device to calibrate your Harley speedometer, as does Kuryakin. Meanwhile, here's a chart to use to check your speedometer. These are passed out by the Mn State Patrol.
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Last edited by MNPGRider; 10-05-2008 at 09:39 AM .
Is speedo more accurate than GPS
10-05-2008, 06:29 AM
