Speedomapper is the simple, free online speedometer for anyone who needs to know how fast they're going. Just open speedomapper.com on your mobile device and you'll see your current speed in realtime.
The map and speedometer work using your device's GPS system to geolocate your current coordinates, heading, and speed. To use this service you must have a device with GPS available and enabled, and you must allow speedomapper.com to access your location. Some operating systems may require you to grant location permissions to your browser application, such as Chrome, from within your system preferences.
Additionally, speedomapper provides the following tools and utilities:
All measurements can be displayed in a variety of relevant metric or imperial units. Use the menu in the upper right to customize the tools to suit your needs.
GPS accuracy varies greatly depending on your network connection and device. To allow devices with highly accurate GPS sensors to leverage their full potential, speedomapper.com reports your current speed to the nearest tenth. This is extremely useful in certain applications such as marine trolling, where a change in velocity of less than one mile per hour can make all the difference.