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shaitan
Occasional Visitor
Joined: Jan 16, 2004
Posts: 8
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 Posted: Sat Jan 24, 2004 9:33 pm Post subject: Gps speed 5-10 mph slower than actual speedometer, thoughts? |
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Hi Guys,
Got sat nav system using tomtom2 and rikaline 6010 gps unit on my xda 2, on the speed display its lower by around 5-10 mph, is this normal? |
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Darren
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Joined: 11/07/2002 14:36:40
Posts: 23848
Location: Hampshire, UK
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| Posted: Sat Jan 24, 2004 9:59 pm Post subject: |
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Yes, car speedo's are set to read up to 10% over true speed. Your GPS is reporting true speed and at constant speed over level ground is the more accurate of the two.
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Darren Griffin
Last edited by Darren on Sun Jan 25, 2004 11:28 am; edited 1 time in total |
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DavidW
Pocket GPS Moderator
Joined: 17/05/2003 02:26:21
Posts: 3747
Location: Bedfordshire, UK
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| Posted: Sun Jan 25, 2004 11:11 am Post subject: |
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See this thread for more information.
David |
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shaitan
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Joined: Jan 16, 2004
Posts: 8
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| Posted: Mon Jan 26, 2004 11:01 am Post subject: |
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| Thanks david, very interesting |
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Minignome
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Joined: Mar 15, 2004
Posts: 10
Location: Kings Lynn
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| Posted: Tue Mar 16, 2004 8:10 pm Post subject: |
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| Darren wrote: | | Yes, car speedo's are set to read up to 10% over true speed. Your GPS is reporting true speed and at constant speed over level ground is the more accurate of the two. |
Does this apply to all GPS systems. I am brand new to Sat Nav using my iPAQ 2210 with Tomtom and I note that my registered speed at 60 mph shows 55 mph on the GPS |
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Darren
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Joined: 11/07/2002 14:36:40
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Location: Hampshire, UK
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| Posted: Tue Mar 16, 2004 8:22 pm Post subject: |
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It applies to all those I have ever tested!
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Darren Griffin |
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MikeB
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Joined: 20/08/2002 11:51:57
Posts: 3859
Location: Essex, UK
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| Posted: Sat Mar 20, 2004 11:43 pm Post subject: |
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| Minignome wrote: | | Darren wrote: | | Yes, car speedo's are set to read up to 10% over true speed. Your GPS is reporting true speed and at constant speed over level ground is the more accurate of the two. |
Does this apply to all GPS systems. I am brand new to Sat Nav using my iPAQ 2210 with Tomtom and I note that my registered speed at 60 mph shows 55 mph on the GPS |
As it isnt the GPS giving you the false reading then all GPS naviigation applications will show this discrepancy.
Intrestingly if you live in America you might know what we are talking about. The last two times I visited Florida the GPS readout and the speedomoter gave the same reading. Both were different cars, which implies that the USA cars have proper accurate calibration on their cars.
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