Dragy Time Result Resolution

Shortly after the Dragy GPS receiver was released I purchased a unit for use in testing.  One of the concerns I had with the product was the 10Hz GPS receiver and the claims of accuracy to 1/100th of a second.

With a sampling rate of once every tenth of a second it didn’t add up that accuracy was to 1/100th of a second.  The question was posed to a Dragy representative and they clarified that the report Dragy outputs that shows times to 1/100th of a second is based on an algorithm that interpolates the value.

Dragy Datalogger Time Resolution
Dragy Datalogger Time Resolution

Since being introduced the measurement performance of the device has been advertised as both 1/10th of a second, on the Dragy page on Amazon.com

Dragy Performance Claim - Amazon.com
Dragy Performance Claim – Amazon.com

and on the Dragy Performance website the claim is that it measures performance to 1/100th of a second.

Dragy Performance on Dragy Website
Dragy Performance on Dragy Website

So why the difference?  The device clearly does not “measure” performance within 1/100th of a second.  That’s not possible since the GPS receiver updates the vehicle position every 1/10th of a second.  Dragy had explained that it doesn’t measure to 1/100th but that it reports based on an algorithm to 1/100th of a second.

I don’t know why the Dragy website advertises a measurement of 1/100th of a second, but by doing so it is likely going to cause disagreements among people interested in the device performance.

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