You can listen in on a two meter repeater and you can build a GPS module speedometer. That’s what [Jeremy Cook] did with just a few parts, a little 3D design, and some handy zip ties to hold it ...

The display itself is a gutted marine speedometer fitted with the movement ... To display road speed, [Grant] stuffed an ATTiny85 with a GPS module into the gauge and cooked up a script to convert ...

Surely the GPS technology should be more accurate than the speedometer? – RP You’re right that GPS is usually more accurate ...

Results are also displayed in real-time on the phone itself with graphs and a speedometer ... v2.0 of its sleek mobile device, and while GPS and 3G have been big draws, the multitude of available ...