For multisport athletes
No matter the terrain, whatever the sport, the RS800CX is the most accurate way to measure your speed and distance as well as plan, monitor and analyze your body's response to your training sessions. You can also see your route on a map after the training session. Ideal for cross-terrain sports like running, cycling, Nordic skiing, in-line skating, and kayaking, this is an essential addition to your training.

Combines training files for different sports, e.g. running and cycling for total data recording
Synchronizes with the Polar ProTrainer 5™ software for guidance, analysis and creating individual training settings
Determines if your training program and recovery time is optimally developing your performance
Highly sensitive barometric altitude sensor shows your elevation profiles

http://www.polarusa.com/us-en/products/running_multisport/RS800CX_MULTI/