Global Positioning Systems (GPS)
Garmin Forerunner 55, GPS Running Watch with Daily Suggested Workouts, Up to 2 weeks of Battery Life, Black - 010-02562-00
Easy-to-use running watch monitors heart rate (this is not a medical device) at the wrist and uses GPS to track how far, how fast and where you’ve run.Special Feature:Bluetooth. Battery life: up to 2 weeks in smartwatch mode; up to 20 hours in GPS...
https://www.bizrate.co.uk/globalpositioningsystemsgps/garmin-forerunner-55-gps-running-oid32620324723.html