GPS vs Speed-O-Meter

[WD40]

I been watching my GPS and sometimes it is slower than my Speed-O-Meter, How does yours check out. Today it was cold out and they were right on.

 

[bushpilot]

the factory speedo's are "GENEROUS" at best....depending on
my acutal speed i can be anywhere from 3 to 5 mph off at a minimum.

the GPS will be more accurate.

 

[RoyBoy]

The 's radar gun will be the most accurate

 

[Tail_Gunner]

With the factory 265 tires, the speedo was about 2 mph more than what the roadside radar said. When I went to 285 tires, the speedo was dead-on to what the same radar unit says, but now the odometer reads about 2% to 3% less than actual mileage based on measured miles or GPS.

 

[bushpilot]

you should find that it varies by speed...it might be spot on @ 55 but
at 80 itll be off several mph.

 

[fordtrucker4life!]

I re-programmed mine when I put on the 285 tires. It is spot on at all speeds.

 

[fordtrucker4life!]

The 's radar gun will be the most accurate

That's only if they have them calibrated.

 

[powerboatr]

The 's radar gun will be the most accurate

OMG dont i know it

anyway doug when my speedo reads 70 the gps shows 68, but when the speedo is readung 75 the gps shows 76

either way i trust the gps most of the time

 

[RoyBoy]

That's only if they have them calibrated.

Robert can tell em that next time...

"Uh sir, when's the last time you had that thing calibrated ?"

 

[BamaSixGun]

Robert can tell em that next time...

"Uh sir, when's the last time you had that thing calibrated ?"

You can actually ask to the see a certificate of calibration, and if its not up to date, you can beat the ticket by a technicality.

They showed it on some TV show once.