Steven_H

Does anyone know of a simple GPS device to check actual speed? Not for serious rallying, just to verify speedometer accuracy.

944Fest (aka Dan P)

ANY handheld GPS will do the job with astounding accuracy.

NCporsche

Planning two routes, a fun run and a Spring Tour, I've borrowed a GPS for verifying mileage. It's a Garmin Street Pilot 2620. Having completed the course for the fun run, and had the event, only one of the 12 Porsches that drove it reported the same mileage shown on the map. Several cars were .5 miles over after the first leg. This leg was 49.0 miles.

Knowing my 944 was running 5% fast, I was surprised to see my GMC pickup runs 2% slow, even with stock tire sizes.

If you can't find one to borrow, you can always do the "cheap bastard" trick. Go buy one, use it for a week and return it.

fuenfer

And this is why most electronics store will charge a 15% restocking fee for GPS units and radar detectors.