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Speedo CalibrationViews : 2585 Replies : 36Users Viewing This Thread : |
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Jul 14th, 2020, 08:23 | #21 |
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Apps and GPS are not as accurate as you think. The satellites look at your position on the surface of the earth but may have difficulty in allowing for the contours!
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XC60 2013 D5 215 SE Lux Nav geartronic |
Jul 14th, 2020, 09:16 | #22 |
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Not talking mountainous regions, but it's a known fact that GPS speed is more accurate than a speedo, I even googled it beifr ei posted to make sure I was correct sill
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Regards, Bashy MY07 (56 plate) V70 Geartronic 2.4 D5 185bhp 173k, 17", full leather, an auto-dimming mirror and auto wipers are the best it can do - I have added (poorly) limo black, rear camera and parking sensors |
Jul 14th, 2020, 09:35 | #23 |
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OK in Lincolnshire and Norfolk but not so good in Wales and Scotland.
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XC60 2013 D5 215 SE Lux Nav geartronic |
Jul 14th, 2020, 16:55 | #24 | |
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Quote:
Paul. |
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Jul 15th, 2020, 04:19 | #25 |
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I dont think our hills are enough to throw out the GPS, GPS is based on horizontal distance, you will find that the speed is based on that, going up or down hill will make no difference as long as its not a sheer vertical drop, as its based on horizontal distance, thats whats measured, whether going up or down, its still basing the speed on last movement. Now, GPS measuring heights, thats totally different, its very poor unless you have an RTK GPS system, perhaps thats what youre thinking of, height measuring?
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Regards, Bashy MY07 (56 plate) V70 Geartronic 2.4 D5 185bhp 173k, 17", full leather, an auto-dimming mirror and auto wipers are the best it can do - I have added (poorly) limo black, rear camera and parking sensors |
Jul 15th, 2020, 19:52 | #26 |
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There's a mathematical difference between horizontal distance and the length of the road on a hill, but on a 1 in 6 hill I make that about 1.4%, on a 1 in 10 incline, probably more relevant to normal use, that difference drops to 0.05%, on a 1 in 100 that's down to 0.00005%.
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David V70 2.5 10v Torslanda Manual 98 Sreg |
Jul 15th, 2020, 20:45 | #27 | |
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Jul 17th, 2020, 02:51 | #28 |
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Who is it that does road GPS maps with contouring?
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Regards, Bashy MY07 (56 plate) V70 Geartronic 2.4 D5 185bhp 173k, 17", full leather, an auto-dimming mirror and auto wipers are the best it can do - I have added (poorly) limo black, rear camera and parking sensors |
Jul 17th, 2020, 10:00 | #29 |
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I'm pretty sure it is on the latest generation models .. It won't be long until all the buildings are photo images like Google Street view!
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Jul 17th, 2020, 14:33 | #30 | |
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I really do not think contours would play apart for speed calculations, its been fine up til now using the same method for years, do you have any think I can read about it, I can see contours being useful for the drive ahead though, ie serious inclines and declines, especially for towing etc, but I really cannot see it for speed calcs, why add millions more data points into the software when its not really needed seen as speed works just fine. It just my opinion on the subject and I must point out, I am rarely right.....
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Regards, Bashy MY07 (56 plate) V70 Geartronic 2.4 D5 185bhp 173k, 17", full leather, an auto-dimming mirror and auto wipers are the best it can do - I have added (poorly) limo black, rear camera and parking sensors |
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