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fuelblue
Occasional Visitor
Joined: Mar 21, 2011
Posts: 2
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 Posted: Sun Mar 27, 2011 8:37 pm Post subject: Camera Alert Inaccurate MPH |
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Why does Camera Alert MPH differ by up to 5MPH (slower) than my actual accurate MPH  |
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mikealder
Pocket GPS Moderator
Joined: Jan 14, 2005
Posts: 19638
Location: Blackpool , Lancs
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| Posted: Sun Mar 27, 2011 8:43 pm Post subject: |
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| Are you sure the cars speedo is accurate, I wouldn't trust it compared to a GPS speed reading assuming your GPS has a good signal it will always outperform a car speedo in terms of accuracy - Mike |
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DennisN
Tired Old Man
Joined: Feb 27, 2006
Posts: 14893
Location: Keynsham
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| Posted: Sun Mar 27, 2011 8:44 pm Post subject: |
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Your actual accurate MPH is inaccurate.
CamerAlert is calculating based on satellite locations accurate to a few yards, measuring time over distance.
Your actual accurate MPH is simply some mechanical thingy which is required BY LAW to never ever under-read and is allowed to be up to 10% over speed.
_________________
Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Sun Mar 27, 2011 9:59 pm Post subject: |
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| DennisN wrote: |
Your actual accurate MPH is simply some mechanical thingy which is required BY LAW to never ever under-read and is allowed to be up to 10% over speed. |
... so all of the car makers set their cheepo speedos to read around 5% too fast on average, so as to be in the middle of the legal window.
Unless you drive police car with a calibrated speedo, trust the sat-nav or GPs to be far more accurate. |
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