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| Red 1993 GMC Jimmy |
My speedometer is out on my 1993 GMC Jimmy and I am about to drive
across country with my Tom Tom GPS unit and I want to know if the speed
readings on my GPS is accurate enough to go off of? Please give best
answers and any advice at all thank you a lot.
Answer: Your TomTom speed reading
is – in general – very accurate. However, it does calculate speed based
on your 2D progress so if the road goes uphill or downhill
significantly, the TomTom will under-report your true speed during that
stretch of road. If you’re using your GPS as a speedometer, you should always err on the side of caution (e.g. if in a 70 MPH zone, try to stay about 66 MPH).
This is because car speedometers always over-estimate (the standards never allow speedometers to under-estimate, so the margin of error is always to have them report a faster speed than your doing). So this means measuring 30 MPH via your speedometer you’re always legal, whereas measuring 30 MPH via your GPS you may actually be over 30 MPH.
This is because car speedometers always over-estimate (the standards never allow speedometers to under-estimate, so the margin of error is always to have them report a faster speed than your doing). So this means measuring 30 MPH via your speedometer you’re always legal, whereas measuring 30 MPH via your GPS you may actually be over 30 MPH.
