The 910 XT worthy successor to the 310 XT, which it inherits all the features, adding a barometric altimeter and the natation.C'est fashion a well made and functional product. Adding the Alti baro provides the same altitude if GPS is disabled or if the signal is too weak (very canyons ...). One can customize his watch by choosing the 16 functions that you wish to display from among the 48 available. GARMIN evolved its product by updating the firmware (Version 2.70 actuellemement). It expands the capabilities by transferring data on GARMIN CONNECT: backup, file activities, display speed, distance, elevation changes .., viewing the route on GOOGLE EARTH ... The use is intuitive, its fields of application very variety, (can replace a bike computer eg ...) In conclusion a great product for those who like to have accurate data on their journeys, or their training. And always with the AMAZON price and top service.