jmk

Just upgraded my Origin Blue-i to a Blue 2. Overall a much better unit regarding features (not too sure about the graphics though). However it displays a different speed to the Blue-i.

With the Blue-i the reported speed was almost a perfect match with my speedo, with perhaps the Blue-i reporting approx 1mph less then the Blue-i at 100mph.

With the Blue2 it’s reporting a speed of approx 6mph less at 50mph than my speedo and a difference of almost 8-9mph at 100mph.

So which is right? I’d have thought GPS should be accurate but how can each unit report a different speed?

And if my speedo is over reporting by possibly 7% then for every 10,000 miles that I drive the car’s milometer is actually clocking up another 700 miles which isn’t doing much good for the value of the car over 50,000 miles.

Anyone have any thoughts?

OllyK

Read the manual, it will tell you how accutrate the GPS unit is, and it will vary with speed. Both my Road Angel and TomTom set up read the same speed, and both about 5mph under the speedo (consistently). I have driven through cameras to the GPS speed and so far not had a NIP, so it would suggest the speedo is over reading, which I would expect as by law they have to be -0% to +10%

GarethE

iTrader: (1)

My Micro Roadpilot tends to read about 3-4mph below the speedo at 30 -70 mph and slightly more at higher speeds but it almost always indicates the same speed as the SECS unit at a steady cruise, unless I'm accelerating hard in which case it has read 40mph under

OllyK

Yes the GPS units are not goo dunder acceleration or deceleration. I have been stationary with the handbrake on with it still showing 30mph before now as well.

Leslie

Needs a steady speed for a short time to get the accuracy with GPS, I got exactly the same speed readouts with two different snooper units and they checked exactly against one of those flashing radar speed indicators in a local village. My speedos are always a bit fast too, as the law requires them not to read slow.

Les