START - Double tap the speed number, the center of the screen. STOP - Double tap the speed number again - You have the option to save your trip. Use As Heads Up Display (HUD) - Tap on the button next to the setting button on the lower left of the home screen. OTHER INFO - There're other details such as coordinates, elevation, compass, and top speed. Single tap on the screen to make them appear. They will automatically fade out after a few seconds so you can focus on the speed. ------------------------------------- FEATURES: ----------- - Shows real time driving speed - Shows real time coordinate, elevation, compass direction, top speed - Keeps track of speeds during the drive and calculate average speed - Shows compass or the direction that user is traveling. - Ability to save each trip - Ability to choose between MPH or KMPH - Ability to choose Coordinate style - Ability to set Auto-Save to save each trip automatically after stopped measuring - Automatically change between dark mode and day mode according to the time of day.