Speedo vs GPS
01-22-2008, 07:59 PM
#21
6th Gear Member
Join Date: Apr 2007
Location:
Posts: 6,414
RE: Speedo vs GPS
ORIGINAL: explict
Speedo'sdisplay slower then the car is moving. I used to run Radar on a F-150 and the Speedo would always read faster then the gun.
Speedo'sdisplay slower then the car is moving. I used to run Radar on a F-150 and the Speedo would always read faster then the gun.
01-22-2008, 09:22 PM
#22
4th Gear Member
Join Date: May 2006
Location: Fort Mcmurray, Ab
Posts: 1,126
RE: Speedo vs GPS
ORIGINAL: explict
Speedo'sdisplayfaster then the car is moving. I used to run Radar on a F-150 and the Speedo would always read faster then the gun.
Speedo'sdisplayfaster then the car is moving. I used to run Radar on a F-150 and the Speedo would always read faster then the gun.
jk
Ya I typed it wrong. I am sure you get the point now though.
ORIGINAL: 06Saleen3v
I will admit that I am tires right now....but does this statement contradict itself?
I will admit that I am tires right now....but does this statement contradict itself?
02-02-2008, 10:05 AM
#25
1st Gear Member
Join Date: Aug 2007
Location:
Posts: 105
RE: Speedo vs GPS
Did anyone notice that the speedo reads faster than the GPS while going around bends or curves in the road? My friend's Garmin Nuvi 200 reads shower than the speedometer on bends, but is almost dead-on on straight roads. I think its because the speedometer reads from wheel rotations, which i would think is most accurate. I could be wrong, but i was guessing that the gps looks at the vehicle's net displacement and calculates speed based on distance traveled vs time elapsed. I would guess that the gps calculated speed at invervals, maybe every second?(no idea) so if you go around a bend, in theory your distance traveled is greater than your net displacement (as the crow flys) by a small amount, resulting in the speed difference.
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