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If my car's speedometer reads 73MPH, trip computer read 70 mph and GPS reads 76MPH, which is more accuate?

If a clear sky, no buildings High around and the GPS has a good view of the sky, GPS is more accurate.

GPS Head-Up Vehicle Speed Display $139.95 Drive safely by not taking your eyes off the road to look down at the speedometer. This GPS Head-Up Speed Display projects your speed right on the windshield. You may also set overspeed warning with the touch of a button. When the preset speed limit is exceeded, a visual indicator lights up and an optional alarm beeps (for up to 15 seconds) to remind you of the speed limit. At 65 mph, looking down…

GSI Waterproof Multi-Function Cycling GPS Computer – Measures Directions, Distance, Altitude, Speed and Calories – LCD Display, USB Interface – Bike/Bicycle/Motorbike Mounting Kit Included $69.99 Advanced New All-In-One GPS Computer from GSI. Ideal for Cyclists and Bikers, it combines all necessary Functions for Exercise and Joy Biking. Comparable to other pricier models out there, it is a great and affordable buy for the outdoors Professional or Beginner….

VDO Z-Series Cycling Computer Wireless Cadence Kit $39.99 This Cadence kit optional and compatible with all Z Series Computers. This kit includes the Cadence Transmitter, Battery, Magnet and all necessary mounting hardware. For models: Z3 PC – Link, Z3, Z2 PC – Link, Z2, Z1….

VDO Z-Series Cycling Computer Second Bike Kit $49.99 Mount-Kit wireless Series-Z including magnet. Contents of packaging: 1 universal mount,1 Clip-Magnet, Z-speed transmitter incl. battery 3V,cable ties. For models: Z3 PC – Link, Z3,Z2 PC – Link, Z2, Z1….