GPS Speedometer - this GPS speed application is a free software for iPhone. It acts as a normal speed gauge, which you may find in any car, showing the velocity of the vehicle you are in in kph and mph.
*This is an ad-supported application. The ads are located on the bottom of the screen.
In miles per hour (MPH)
You can set the app to kmh or mph.
Some features of the speed app include:
-Shows you your current GPS position - Longitude, Latitude, as well as your top speed.
-Your current speed and your maximum velocity, according to the sattelites.
-Both the analog and digital speedometer views can be either in miles or kilometers per hour.
HUD - heads up display
-You can switch to HUD mode, which will show you your velocity digitally with large green numbers.
*Tested on iPhone 4s