Garmin has a pretty strong foothold in the GPS sports watch arena; it's an area it's been involved in for over 10 years. The original Forerunner range paved the way for the likes of the Forerunner 15 by measuring speed, distance, pace and calories burned, and it ran from a pair of AAA batteries – which would get you around 14 hours of action.

2003: Garmin Forerunner