Displays your current speed in an overlay which you can place over your navigation app when driving.
Customise size, position, colour and transparency.
Supports Kilometres per hour and Miles per hour units.
Analogue speedometer, or digital speed readout with average speed.
Tap overlay to reset the average speed (great for average speed cameras on the motorway).
Will continue to show over your navigation when it is running on the lock screen.

Instructions:
To open the settings, long press in the bottom left corner.
To close the app press the launch icon again or long press the top right corner.
Long press and then drag the top left corner to move the overlay and the bottom right corner to resize it.

Speed Overlay is currently being actively developed. If you encounter a problem, please consider using the Email Developer link below rather than just leaving a low rating, that way I can attempt to resolve the problem for you ASAP.

Caveats:
The speed is only as accurate as your GPS. At slow speed it will be prone to some variation due to GPS jitter. It will be more accurate in motorway driving than city driving - so just fine for keeping an eye on those annoying average speed camera zones on the motorway.