GPS running watches vary in size ... a compass and altitude above sea level via an in-built altimeter. Each brand featured in this round-up has a smartphone app linked to its watch.

get it If you want a watch you can take everyone ... with unlimited battery life (when not in GPS mode), a built-in 3-axis compass and barometric altimeter, multiple global navigation satellite ...

TL;DR: Garmin's Instinct line of GPS watches is on sale on Amazon ... equipped with a built-in three-axis compass, a barometric altimeter, and support for several global satellite systems ...

The features on this watch are impressive with – deep breath – dual-GPS, a 10-day battery life, altimeter, accelerometer, plus continuous heart rate, blood oxygen, steps and floors climbed all ...