The entire system is built on the backbone of an Arduino Uno with a few other parts totaling at about $150. That seems expensive, but DeBoisblanc's build covers a lot of ground.

The GPS Speedometer and Odometer app is perfect for tracking and logging all kinds of employee travel information. It includes a heads-up display (HUD) mode for use in a car windshield.

Sky Drive is intended to give you accurate speed and odometer readings and it does so while taking out all of the guesswork and hassle normally associated with calibrating speedometers. The Sky ...