TheBeastie Posted September 16, 2007 Share Posted September 16, 2007 Has anyone noticed this before or is is (another) unique feature of The Beastie. Driving daughter back to uni at Aberdeen yesterday I needed SatNav to locate her flat and left it on again to find my way out. Half way home I stopped for a coffee and tinkered with the settings to show my speed. What I found was that the SatNav (TomTom) was consistently putting my speed about 10% below the speed shown on the speedometer. Is this usual, or is SatNav speed not to be trusted or is my speedometer not calibrated. So far as I know I have standard wheels and tyres. If SatNav is right then I am cool with it since gives me nice safety allowance on speed cameras, although I am bombproof on 70mph camera since according to SatNav I only just hit 70 going downhill with big wind behind!! Anybody else experienced this discrepancy? Malcy Quote Link to comment Share on other sites More sharing options...
western Posted September 16, 2007 Share Posted September 16, 2007 normal non electronic vehicle speedo are not calibrated, they can have a 10% error margin on the IIRC high side so a speedo showing 70 means your doing about 65 as a example. Quote Link to comment Share on other sites More sharing options...
TheBeastie Posted September 16, 2007 Author Share Posted September 16, 2007 Ah - that is perhaps why long journeys always seem to take longer than expected. And also perhaps why I get overtaken so often. Never mind though - I get to see the countryside ! Thanks BTW western - were you on holiday? Noticed a long absence of your posts and hoped all was well Malcy Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted September 16, 2007 Share Posted September 16, 2007 GPS is more accurate that a non calibrated Speedo. If you do a search, there's been a previous post on this, GPS works on averaging distance over time, certain GPS units consider all three planes, others, only two, so speed with a vertical component can be inaccurate. Still, a GPS is still going to be more accurate than a LR speedo. I use my GPS speedo, all the time. Quote Link to comment Share on other sites More sharing options...
edwardatherton Posted September 16, 2007 Share Posted September 16, 2007 Every vehicle I have been in has a speedo with a different reading than the satnav/gps. The S1 reads 28mph when I am doing 30, nearly every modern vehicle reads 30 but is doing 27mph. Trick is to remember which vehicle does what...! Quote Link to comment Share on other sites More sharing options...
western Posted September 16, 2007 Share Posted September 16, 2007 Ah - that is perhaps why long journeys always seem to take longer than expected.And also perhaps why I get overtaken so often. Never mind though - I get to see the countryside ! Thanks BTW western - were you on holiday? Noticed a long absence of your posts and hoped all was well Malcy sort of a working holiday @ Greenbelt Festival on the Fire & Rescue team, I'm Deputy of the Fire Support team. didn't have my laptop with me so couldn't get on-line to pop in here. had a good time not to busy with incidents, 2 lock outs from cars & 3 jump starts plus keeping the 4x4 fire vehicles on duty & fully upto spec, got in a visit to Glouscestershire Fire control one evening, very interesting, hopefully next year we can arrange a visit to the central workshops. Quote Link to comment Share on other sites More sharing options...
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