Speedo not running true...

[myvice]

You could try Auck speedo services for calabration, he's on Newton Rd next to the Shell? station just down from Upper Queen St. Brake testing rollers only move @ 6kph or so, I'd get a pushbike speedo caus its cheep, weather-proof, small, comes with mounts for your bars and you can tell dickheads its a gage for your NOS bottle...AMPS has a dino (so I'm told) but I dont know if it has a speedo or not. Let me know how you got on caus my ones out too, about 10-20 ks too high so I'm not gunna lose sleep over it.

[Biff]

In my old car my speedo would read 90 MPH, the in car SATNAV would read 86MPH and the stickonthewindscreen GPS driven traffic/speed camera warning device (www.roadangel.com) would read about 93 MPH. So almost a 10 MPH discrepancy between the in-car GPS whatsit and the stickieonone.

After talking to my satellite guru buddies, asking them why the discrepancy between my car SATNAV and my Road Angel, they gave me all kinds of reasons why GPS isn’t necessarily the most accurate way of measuring speed (Doppler shift, multi-path interference, propagation issues etc).

The bottom line is - these boffins (and I mean real boffins as opposed to I know everything about anything cos I’m a cleverfockerpretenboffin) told me that it's a popular misconception that GPS is the be and end all to measuring speed accurately. That it’s only truly accurate when used in conjunction with other devices, such as gyroscopes etc.

We'll have to wait for the Galileo system to be fully operational before we can be more reliant on satellite positioning/speed/distance accuracy. Allegedly.