With the Garmin Forerunner 310xt. Handheld GPS units offer 3-D maps, full-colour screens, temperature readings, and barometric pressure readings. This forerunner currently on sale through this Amazon link. Let’s take a look at all of the 310xt forerunner features:. The swim-proof Forerunner 310XT is waterproof to. When you&apost;re ready to jump out of the water. Ve logged the miles innovative ANT wir. Find view and go to locations at anytime? The Forerunner 310XT is also ideal for dingy sai. S Hogg.,.