Both your sat nav and speedo were breaking the speed limit. If you are going up and down hills sat navs are not accurate. The speedo may also be slightly out. But as long as it does not indicate less than the actual speed it is legal.
I have, it makes no difference to the speed indicated on the nav.
Sorry but you are wrong a GPS measures time between two points and calculates speed from time taken to cover that distance, if you are going up or down an hill those two points are closer together than the distance travelled up or down the incline. Therefore the speed reading is incorrect. Only slightly maybe but incorrect never the less.
Sat navs use at least 3 satellites to create a 3d position. Hence going up/down hill doesn't count. Yer sat nav will also tell yer height above sea level anorl.
If they do I can't find it in the menu options on mine.Clever bloody things then do they brew up when you get to where you're going?
The X and y potion (ie longitude and lat) will be accurate due to triangulation, and more so the more satellite signals it receives. The z ( height) will vary and is only really accurate when confirming via a base stationMy sat nav must be working in 3d then as when I move it up or down it goes up/down by 1 meter.
APCO guidelines were used as a guide for speed cameras, they however do not have to have 10%+2mph as their capture reading.
Complete rubbish. xyz graphs are easily calculated using maths (trigonometry) against time and the tolerance must be good as 1m changes by 1m interval when manually moving up/down. It doesn't use xy then z, it uses xyz. The satellites are orbiting in xyz themselves around our planet (ask young porky). You never know where you are in the 1 meter unless you slowly move to the edge of it. It was bought in 2006. I will film it for the non believers.
Think what you like but that's the way it works. The z will be within a reasonable ballpark but not comparable to the X and y accuracy. Surveying gps use local base stations or wap enabled units to correct the z position.
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