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hgvman Occasional Visitor
Joined: May 18, 2005 Posts: 2 Location: wigan united kingdom
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Posted: Wed May 18, 2005 5:04 pm Post subject: displayed speed accuracy |
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can anyone tell me how accurate the displayed speed on the hp 1710 is, when travelling at 54 mph it says i am doing 50mph, does anyone know, maybe my speedo is out. |
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Privateer Pocket GPS Moderator
Joined: 30/12/2002 17:36:20 Posts: 4916 Location: Oxfordshire, England, UK
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Posted: Wed May 18, 2005 5:34 pm Post subject: |
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Hi hgvman,
to the forum!
Are you in Europe?
Please update your profile as it does help us to help you.
It’s a requirement in the UK and I think for certain other countries in Europe that the speedometer over reads by as much as 10%, but it should never under read.
Your SatNav should display a much more accurate speed than your vehicle’s speedometer if:
You’re travelling at a constant speed and direction
You’re not travelling on an incline
You haven’t got a calibrated speedometer in your vehicle.
I would have though that your tachograph would read a very similar figure to that of your SatNav system.
Regards, _________________ 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
Garmin Camper 770 LMT-D |
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transit Occasional Visitor
Joined: Apr 12, 2005 Posts: 11 Location: west midlands
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Posted: Wed May 18, 2005 11:15 pm Post subject: |
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yep same here my speedo reads about 5 mph more than my sat navs showing. _________________ tom tom one classic v4 |
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MarkHewitt Frequent Visitor
Joined: Nov 16, 2004 Posts: 1077 Location: Chester-le-Street & York
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Posted: Thu May 19, 2005 7:56 am Post subject: |
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Pretty much consistently 10% out on my car. I've tested it against those road side warning signs which display your speed and the sat nav proved to be the accurate one.
Many cars speedos overread, in a 30mph limit I often find myself behind people doing 25mph, presumably they think they are doing 30!
It's very useful to know this, because even when I'm not using the sat nav I know I can go up to 75mph on the speedo safe in the knowledge my real speed is not in excess of the limit. |
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hgvman Occasional Visitor
Joined: May 18, 2005 Posts: 2 Location: wigan united kingdom
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Posted: Thu May 19, 2005 4:07 pm Post subject: |
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well, i hope you are all right, cos i had the foot down on a dual carriageway doing 55 mph, (speed limit for hgv 50 mph), and didnt spot the safety camera van til it overtook me, thats when i checked speedo against sat nav so fingers crossed |
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cyclopops Occasional Visitor
Joined: Mar 16, 2005 Posts: 28
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Posted: Sat May 21, 2005 9:49 am Post subject: |
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are'nt HGV speedos calibrated for tachograph use? making HGV speedos accurate |
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kartracer Frequent Visitor
Joined: 26/03/2003 20:15:33 Posts: 502 Location: United Kingdom
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Posted: Sat May 21, 2005 11:20 am Post subject: |
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All standard vehicle speedometers give an estimate based upon the frequency with which the road wheels rotate. So unless you recalibrate very frequently the accuracy is bound to vary, with tyre wear amongst other things. As your tyres wear out your speedo will overestimate by a larger amount because your road wheels are rotating more often at any given road speed. Unless your GPS is faulty it should always give the more accurate reading on a straight and level road. _________________ Kam |
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