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micmac
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Joined: Jul 09, 2005
Posts: 60
Location: Worcester Park
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 Posted: Tue Nov 01, 2005 6:17 pm Post subject: Mph on Tom Tom Go incorrect |
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Hi, I have noticed lately that when I am in my van the tom tom go 700 is 3mph slower than on my speedometer. Any ideas?
Purchased unit in July 2005.
micmac |
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Privateer
Pocket GPS Moderator
Joined: 30/12/2002 17:36:20
Posts: 4914
Location: Oxfordshire, England, UK
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| Posted: Tue Nov 01, 2005 7:18 pm Post subject: Re: Mph on Tom Tom Go incorrect |
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| micmac wrote: | Hi, I have noticed lately that when I am in my van the tom tom go 700 is 3mph slower than on my speedometer. Any ideas?
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Yes, put it back in the box and return the GO - it's faulty! 
Sorry, I couldn’t resist it, as that question has been asked many times before. 
Seriously, the GO's speed reading on level surface, in a straight line, at a constant speed, will always be more accurate than your van's speedometer.
Regards,
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Robert.
iPhone 6s Plus, iOS 14.0.1: iOS CamerAlert v2.0.7
TomTom GO Mobile iOS 2.3.1; TomTom (UK & ROI and Europe) iOS apps v1.29
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micmac
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Joined: Jul 09, 2005
Posts: 60
Location: Worcester Park
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| Posted: Tue Nov 01, 2005 9:02 pm Post subject: |
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nice one!
:D |
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tomthompson
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Joined: 26/08/2003 15:43:37
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Location: Southampton, UK
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| Posted: Wed Nov 02, 2005 8:39 pm Post subject: |
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Of course if your going uphill or down dale that rule does not apply
Shucks is nothing in life simple
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Asus Zenfone 2 twin sim, Garmin Zumo 550, 660 and pocketgps speed camera database
I keep on learning but they invent new things faster ,How do I keep up ? |
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rkm_hm
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Joined: Nov 28, 2004
Posts: 532
Location: Warwick, UK
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| Posted: Tue Nov 08, 2005 4:36 pm Post subject: |
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| tomthompson wrote: | | Of course if your going uphill or down dale that rule does not apply |
Yes, but not by very much!
Assuming that the GO measures the horizontal component of your speed, your actual speed will be higher by a factor determined by the Secant (reciprocal of cosine) of the slope. The error is only 1% for 8 degrees (1 in 8) - so it's still a damn site more accurate than the exaggerometers fitted to most vehicles!
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Roger
TomTom via135
Satmap Active 10+ v1.50 with full UK 1:50k map and 1:25k/1:10k County maps of Hampshire & Warwickshire |
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neil01
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Joined: May 06, 2005
Posts: 902
Location: Leeds
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| Posted: Tue Nov 08, 2005 5:00 pm Post subject: |
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Assuming that the sat nav is correct - I think you are quite lucky to have a speedo which is only 3mph out! If I remember correctly, a speedo is allowed to be 10% out.
My understanding is that most (if not all) speedos overstate your actual speed. |
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Bigstoo
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Joined: Nov 01, 2005
Posts: 29
Location: Republic of Yorkshire
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| Posted: Tue Nov 08, 2005 5:06 pm Post subject: |
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| also if you have fitted non-standard wheels/tyres to the van/car, this will affect it also. |
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neil01
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Joined: May 06, 2005
Posts: 902
Location: Leeds
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| Posted: Wed Nov 09, 2005 7:26 pm Post subject: |
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| And may consequently be illegal. Any replacement tyres should have the same rolling distance as the factory specified originals. |
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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: Wed Nov 09, 2005 7:42 pm Post subject: |
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| neil01 wrote: | | And may consequently be illegal. Any replacement tyres should have the same rolling distance as the factory specified originals. |
Not necessarily, however any modifications that affect the accuracy of the speedometer may be an offence unless it is re-calibrated accordingly.
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neil01
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Joined: May 06, 2005
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Location: Leeds
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| Posted: Wed Nov 09, 2005 9:48 pm Post subject: |
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| As I said - 'MAY'. |
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JimmyTheHand
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Joined: Apr 16, 2005
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| Posted: Wed Nov 09, 2005 10:33 pm Post subject: |
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| neil01 wrote: | Assuming that the sat nav is correct - I think you are quite lucky to have a speedo which is only 3mph out! If I remember correctly, a speedo is allowed to be 10% out.
My understanding is that most (if not all) speedos overstate your actual speed. |
They have to be within 0% to +10% (i.e. they must never tell you you are going slower than you are, but can overstate the speed by 10%) -
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