Some of the highlights of Garmin Fenix, in addition to the GPS receiver of course, is the compass, altimeter, barometer, and the optional external ANT connected temperature sensor. Some other features include the ability to plan trips and create routes, record waypoints, and record GPS bread crumb trails. You can also navigate to coordinates if you wish. You also get a 3-axis electronic compass to get your heading even when you’re stationary.
Fenix, which is water proof to 50 meters can last 50 hours in GPS mode and up to 6 weeks in plain watch mode.