Topeak Bicycle Computers and Heart Rate Monitors
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Heart Rate Monitoring allows a sensor, often a chest strap, to transmit your heart rate to your computer. Heart rates monitors are typically wireless.
GPS, or Global Positioning System, is a satellite based system that provides accurate location and altitude information.
Some cycling computers can display a power reading, usually in watts. They usually require a separate sensor - in some cases a special hub or crank arm. A few will estimate the value based on speed, cadence, rider weight or other data. "Optional" means it can read from a separate power meter or sensor. "Included" means it is calculated by the computer or includes the neccessary sensor.