Bizarre speed reading from Garmin 500
06-23-10, 09:09 PM
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Bizarre speed reading from Garmin 500
After loading up my latest ride from my Garmin, I noticed that it stated my max speed as having been 56.6 mph- a speed which I know damn well I was never anywhere close to. When I went through the Player screen, it didn't show any odd spikes or clearly errant readings in the charts, just this rogue number listed as my max speed.
Checking to see if it was a one off issue, I looked through my previous rides, and a couple weeks ago it said I'd hit 63.6 mph. Does anyone know what would cause this? I really don't want errant figures in my stats.
Checking to see if it was a one off issue, I looked through my previous rides, and a couple weeks ago it said I'd hit 63.6 mph. Does anyone know what would cause this? I really don't want errant figures in my stats.
06-23-10, 09:33 PM
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Are you using you speed/cadence sensor?
GPS readings can shift around a little. I've seen peaks of 500kph on an older garmin.
GPS readings can shift around a little. I've seen peaks of 500kph on an older garmin.
06-23-10, 09:34 PM
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I want to use the training program you're on! 
My 500 hasn't ever done that. Do you suppose you might have left it on while driving to or from a ride?
My 500 hasn't ever done that. Do you suppose you might have left it on while driving to or from a ride?
06-23-10, 09:57 PM
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Yep, I'm using the speed/cadence sensor, and no, unfortunately the maps say I stayed right on course- no part of my driving route.
06-23-10, 10:01 PM
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I've gotten weird readings with Endomondo, the smart phone app that uses the GPS. Said I was going 55 when my cyclocomputer peaked at 45.
My guess is that the GPS signal went in and out and must have miscalculated an average between two points.
My guess is that the GPS signal went in and out and must have miscalculated an average between two points.
06-24-10, 04:53 AM
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happened to me on bike2 (no speed/cadence sensor) on that one. make sure that your speed/cadence sensor is enabled and being picked up by your garmin.
06-24-10, 04:58 AM
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Happens to me pretty often when riding through town and I go behind a set of buildings for a bit. The worst I've seen is it saying I hit 88mph on my commute to school
06-24-10, 05:04 AM
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Mine has logged 127mph.
Every once in a while, maybe a 1 in 10 training rides I'll get a single point that is a definite outlier. *shrug* not a big deal.
Every once in a while, maybe a 1 in 10 training rides I'll get a single point that is a definite outlier. *shrug* not a big deal.
06-24-10, 08:09 AM
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I had an old Garmin Legend hiking GPS that I mounted on my MTB. Once it got the coordinates wrong on a ride and showed me having traveled to Scranton, PA (about 300 miles south) and then back again in the space of about 2 seconds. Needless to say, my speed and distance results were a bit off for that ride. (But hey, I logged them anyway; need all the help I can get & who am I to argue with a GPS unit?).
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