Trial features:- Display overlay with speed information on your screen- Display last two digits of your speed in notification area- Choose between km/h and mph- Starts automatically when connected to car dock

Pro features:- Speeding alerts (using threshold system, automatic system is planned)- Smart alert volume adjusting to background noise- Configurable speed overlay behaviour (hide, show only if Navigator is running)- Trial notice removal- And you will support independent developer and encourage me to add new awesome features!

This is a beta version supported via xda-developers forums, but e-mail communication is also available, especially for Pro users customer support.