quick_spider Posted March 3, 2005 Report Share Posted March 3, 2005 I've got an ipaq 3360 with a Fortuna Clip On Bluetooth GPS which works very nicely with TomTom Navigator 3. At low speeds, the speed readout is pretty accurate - it ties up with the car speedo. At higher speeds it reads lower than the real speed - more than 10% out at 70mph. I've checked it in several cars so it's not that the speedo's are off. Has anyone else got a GPS system? How accurate is the speed reading? Jon Quote Link to comment Share on other sites More sharing options...
Dan Hardman Posted March 3, 2005 Report Share Posted March 3, 2005 my gps is on average 3-5mph less than what the speedo says im doing. Quote Link to comment Share on other sites More sharing options...
quick_spider Posted March 3, 2005 Author Report Share Posted March 3, 2005 my gps is on average 3-5mph less than what the speedo says im doing. ← Ta. Any ideas why? My only thoughts are it doesn't account for height so being around 150m higher than sea level which should make a difference of 2.5%. I'm sure the M6 is lower than this anyway which is where I noticed it. Jon Quote Link to comment Share on other sites More sharing options...
JTM Posted March 3, 2005 Report Share Posted March 3, 2005 When going to wales for the indoor event, I was usng my mates josh's GPS and it does chat shit when speed is concerened. I was doing 90ish and it was saying 81/82mph. Good for directions, crap for speed! Quote Link to comment Share on other sites More sharing options...
Dan Hardman Posted March 3, 2005 Report Share Posted March 3, 2005 Ta. Any ideas why? My only thoughts are it doesn't account for height so being around 150m higher than sea level which should make a difference of 2.5%. I'm sure the M6 is lower than this anyway which is where I noticed it. Jon ← but, speedos are out by a few mph anyway, so the gps could even be correct. guess we shall never know Quote Link to comment Share on other sites More sharing options...
quick_spider Posted March 3, 2005 Author Report Share Posted March 3, 2005 but, speedos are out by a few mph anyway, so the gps could even be correct. guess we shall never know ← Yeah I thought that, so I checked it out in 4 other cars (All different ages/makes/models) At least I know the whole thing is crap for speed and it's not just mine. Jon Quote Link to comment Share on other sites More sharing options...
Dan Hardman Posted March 3, 2005 Report Share Posted March 3, 2005 well, gps is for giving you directions to where you want to go not speed, so if it give directions correctly then i guess its doing its job :( anyway, its a pain in the ass to even read the speed on my gps as its in tiny writing at the bottom of the screen, easier to look at the speedo :S Quote Link to comment Share on other sites More sharing options...
tipsy Jock Posted March 3, 2005 Report Share Posted March 3, 2005 There not really designed for giving speed, you want a gps speedo for that. They're great fun for direction though :( My dad has one for when he's flying, we had a great time using it to navigate and mess about whenever i had to/from uni/home. Pete Quote Link to comment Share on other sites More sharing options...
matt_urban Posted March 3, 2005 Report Share Posted March 3, 2005 Car speedos are out at 70 mph a max of 10% if standard wheels are fitted more or les with bigger smaller tyres gps is not accurate for speeds ! think its beamed from space :( Quote Link to comment Share on other sites More sharing options...
quick_spider Posted March 3, 2005 Author Report Share Posted March 3, 2005 Have dug about a bit more. Seems like GPS is accurate to 0.1mph if you're driving at the same speed in the same direction for a few seconds. It's illegal for a car speedo to underestimate the speed, it has to be within 0-10% over. Fords are apparently particularly shite for this. I think the software has a function to display the speed in large letters (not that I need it) when you exceed the 'safety speed' The default is 124mph :( What's a GPS Speedo when it's at home? I can't see it giving any different readings to a normal GPS system. Jon Quote Link to comment Share on other sites More sharing options...
tipsy Jock Posted March 3, 2005 Report Share Posted March 3, 2005 I dunno, they were talking about it in the gumball rally dvd lol Pete Quote Link to comment Share on other sites More sharing options...
Dan Hardman Posted March 3, 2005 Report Share Posted March 3, 2005 cant you find someone with a digital speedo? then check your gps with that as i beleive the digital speedos are spot on Quote Link to comment Share on other sites More sharing options...
quick_spider Posted March 3, 2005 Author Report Share Posted March 3, 2005 I need to get me a ride in a police get :( They have theirs calibrated very accurately. Jon Quote Link to comment Share on other sites More sharing options...
matt_urban Posted March 3, 2005 Report Share Posted March 3, 2005 i was doing 100mph today but sat still lol i love the ice lol Quote Link to comment Share on other sites More sharing options...
Tomm Posted March 4, 2005 Report Share Posted March 4, 2005 I presume if you're going in a dead straight line on a completely flat road, it'll be more accurate. But that rarely happens, surely? Quote Link to comment Share on other sites More sharing options...
quick_spider Posted March 4, 2005 Author Report Share Posted March 4, 2005 I presume if you're going in a dead straight line on a completely flat road, it'll be more accurate. But that rarely happens, surely? ← I think it's supposed to need about 5 seconds... it's pretty easy to be accurate on a motor way. Jon Quote Link to comment Share on other sites More sharing options...
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