sat nav vs. speedo

[dragongreengolfgti]

Well i done a 230 mile round trip today mostly motorway bit of a roads and was curious at how far out my speedo was against the gps sat nav reading and any figure given on my speedo at any mph was 2 mph out from the sat nav  just thought i'd share that with you all 

[Screech16v]

My speedo 80
Sat nav 75

[Mr GTD]

Well i done a 230 mile round trip today mostly motorway bit of a roads and was curious at how far out my speedo was against the gps sat nav reading and any figure given on my speedo at any mph was 2 mph out from the sat nav  just thought i'd share that with you all 

That's not bad at all!

What sat nav is it?

[dragongreengolfgti]

Well i done a 230 mile round trip today mostly motorway bit of a roads and was curious at how far out my speedo was against the gps sat nav reading and any figure given on my speedo at any mph was 2 mph out from the sat nav  just thought i'd share that with you all 

That's not bad at all!

What sat nav is it?

thats what i thought  it's a garmin satnav not sure on the model etc but its a good one 

[AlexMozza]

I though speedos were out by +/- 3% anyway?

[dragongreengolfgti]

I though speedos were out by +/- 3% anyway?

Yeah but on a 14 year old car running different size wheels to standard etc i think 2 mph difference is quite good  i'm just surprised thats all lol

[AlexMozza]

[DubFan]

I've not tried it in the new car, but in my last 2 cars the speedo would indicate 33mph when the sat nav gave the true speed as 30mph.
I should try it in the new car though just so I can benchmark it, it shouldn't be too far out as it's only 5 years old.

[luke]

car says 70, sat nav says 77, didn't feel very fast, was in the left lane aswell 

[Bellend]

With 40PSI in all four tyres the Skoda reads DEAD accurate.

It's pretty scary.