You can listen in on a two meter repeater and you can build a GPS module speedometer ... depending on whether you’re stationary, below 5 km/h, or above 5 km/h. All these electronics are stuffed ...

Built for simplicity, elegance, and extreme practicality, Speed is a GPS speedometer that uses the iPad’s location data to tell you how fast you’re traveling. It works with iPads that have GPS ...

as GPS and ground-based stations can sometimes be unreliable or unavailable. The Los Alamos National Laboratory has introduced the "Spacecraft Speedometer," a novel technology for tracking ...