GPS Speedometer

Speed is computed from GPS and lags a car's own speedometer by a second or two. In a tunnel or between buildings there is no signal and the number freezes. A car speedometer usually reads high, so a disagreement is normal rather than a fault.

The instrument uses the phone's GPS and shows the value in km/h.

• A car cluster: the arc turns yellow after 60 and red after 120.

• The trip peak stays as a mark on the scale.

• A 15-second time-speed chart with marks at 60, 120 and 180.

• A daylight scheme for the windscreen — sun and moon.

• SHARE sends a picture of the peak on the dial.

• A trip records itself: distance, time, average and peak.

• No ads. Under a megabyte.

Location is used only to compute speed. No route is stored or sent anywhere.

The app sends anonymous usage statistics; you can turn this off in settings.

Independent development: one person builds and maintains this app. A letter to [email protected] is read by that person, not by a support desk.