A Cycle Computer, Cyclocomputer or Cyclometer is a device mounted on a bicycle that calculates and displays trip information, similar to the instruments in the dashboard of a car. The computer with display, or head unit, usually is attached to the handlebar for easy viewing. A basic cyclocomputer may display the current speed, maximum speed, trip distance, trip time, total distance traveled, and the current time. More advanced models also may display altitude, incline (inclinometer), heart rate, power output (measured in watt) and temperature as well as offer additional functions such as average speed, pedaling cadence, a stopwatch and even GPS navigation. They have become useful accessories in bicycling as a sport and as a recreational activity.