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How is speed calculated? (Nuvi 660)

Former Member over 14 years ago

When I select the speed display on my Garmin GPS, how can I know the accuracy?

I understand that most accurate speed is calculated via doppler shift measurement from satellite signals.

The lesser-accurate way to calculate is to simply by the change in distance over time.

Which is speed calculation method is used in my Nuvi 660?

Thanks,
Dave

0 Former Member over 14 years ago

How is speed calculated? (Nuvi 660)

Just received an e-mail reply from Garmin. I had inquired about the method of calculating the displayed speed of the vehicle:

"...the speed that is displayed in your device is a product of the time and distance calculation, for all automotive devices."

So apparently Garmin doesn't use doppler-shift speed calculation for any of its automotive GPS's.

Thanks,
Dave