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RoystonB Occasional Visitor
Joined: Aug 16, 2006 Posts: 19
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Posted: Tue Sep 19, 2006 1:31 pm Post subject: How fast am I going? |
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Hi All,
This must have been asked before, but here goes.
I have noticed that with the speedometer showing 70mph my TomTom 710 shows 65mph.
To get the TomTom to show 70mph the speedometer has to be registering in the region 76/77mph, which can be a little worrying if near the speed cameras.
So how accurate is the speed shown on the TomTom 710?
Many thanks, RoystonB 8O |
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zzr1200 Lifetime Member
Joined: Jun 05, 2005 Posts: 205 Location: Gloucestershire
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Posted: Tue Sep 19, 2006 2:20 pm Post subject: |
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The GPS is the accurate one. Car speedos generally have a bit of tolerance in them so that it reads slightly higher than you are actually going so that you don't get caught for speeding.
Different makes of car have different speedo accuracies as well. My BMW is extremely accurate upto about 100MPH (speedo says 100MPH, GPS says 99MPH), my wifes Renault speedo reads about 6/7% fast.
Hope that helps. |
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shauneco Regular Visitor
Joined: Feb 10, 2006 Posts: 135 Location: Mansfield,Nottinghamshire
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Posted: Tue Sep 19, 2006 2:26 pm Post subject: |
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Not all car speedo's are 100% accurate usually a few MPH out either way, Also the TomTom's speed is reasonablly accurate on mine, It's a delayed reaction to the actual speed you're going, For this reason only take the speed on the TomTom as a very rough guide, You're cars speedo will be more reliable. |
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trog100 Regular Visitor
Joined: Sep 15, 2006 Posts: 195
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Posted: Tue Sep 19, 2006 2:36 pm Post subject: |
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i understand the satnav speed to be pretty reliable.. mine consistently reads 10% slower than my speedo..
i believe the satnav no question..
trog |
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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: Tue Sep 19, 2006 2:40 pm Post subject: |
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Don't forget that your GPS speedo may be up to a second slow, i.e. if you have just started to accelerate, the GPS reading of the speed will be slow.
As long as you have been driving at a constant speed, in the same direction, on a level horizontal plane, for over a second then your GPS speed reading should be far more accurate than your vehicle's speedo.
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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pujro Occasional Visitor
Joined: Sep 17, 2006 Posts: 1
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Posted: Tue Sep 19, 2006 2:58 pm Post subject: |
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mine reads about 2 or 3mph higher than the car....so about 5% out. |
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Tim Buxton Pocket GPS Moderator
Joined: 14/09/2002 20:56:18 Posts: 5231 Location: Surrey, United Kingdom
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Posted: Tue Sep 19, 2006 5:09 pm Post subject: |
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shauneco wrote: | Not all car speedo's are 100% accurate usually a few MPH out either way |
Not either way. It is illegal to have a speedo which shows you travelling slower than your actual speed. _________________ Tim |
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Green_ninja Occasional Visitor
Joined: Apr 27, 2006 Posts: 51
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Posted: Tue Sep 19, 2006 5:27 pm Post subject: |
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Car speedos have to read with in 10% at 30mph and 70mph and they MUST NOT underread, so the fac that your speedo is showing a faster speed is OK. |
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shauneco Regular Visitor
Joined: Feb 10, 2006 Posts: 135 Location: Mansfield,Nottinghamshire
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Posted: Tue Sep 19, 2006 5:51 pm Post subject: |
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Tim Buxton wrote: | shauneco wrote: | Not all car speedo's are 100% accurate usually a few MPH out either way |
Not either way. It is illegal to have a speedo which shows you travelling slower than your actual speed. |
Thanks for correcting me, I knew that they were not perfect. |
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nmbaker Banned
Joined: Dec 11, 2005 Posts: 66 Location: Bolton, Lancashire
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Posted: Sun Sep 24, 2006 12:43 am Post subject: In modern cars there is often an electronic speed inhibitor |
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This is to stop you blowing the engine. On my Vecrtra SRi V6, it was set at 150mph. In Germany, I was showing 160 on the clock, GPS got to 150 and it felt like someone stamped on the brakes. I believe the GPS, but in stop/start traffic queues, I do not believe GPS or speedo, only ETA with approximation. BTW that was using a Garmin GPS12 with a Psion 5mx using TomTom RoutePlanner years ago. Nowadays, I do not go much over 120 as my job is not nearly as stressful and I have to do a lot more miles in a week than previously.
One nice feature you will find in the new version when you can buy it is that you can set to arrive at a particular time, so you know if you are on schedule or behind schedule. Is very handy if you have to arrive for appointments.
I know that if you had ETA displayed, it gave similar information, but this is better for me. Green on time - Red late _________________ TomTom Go720 v8.320
Maps - latest 830NA,W&CE,C&EE,UK&ROI
TomTom Home 2.6.3.609
TTCams latest 19/05/09 Traffic - live
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