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* The Fenix 3 will upload your workouts to Garmin Connect via USB, WiFi, or via a smart phone and Bluetooth. The smart phone can upload a workout as it takes place, which is nice for folks tracking you during a race, though it means wearing the watch and the phone together. If you plug the Fenix 3 into a computer it will function as a flash drive, giving you direct access to your workouts as '.FIT' files. The FIT files provide compatibility with a huge range of software.
* The Fenix 3 will not display [[Heart Rate Variability]] but it is possible for it to record [[Heart Rate Variability]] for later analysis. To enable this recording, you need to download a special FIT file from the firstbeat.com web site. (There is a [[Connect IQ]] app that will calculate HRV, but you can't use it during a workout, something I hope will be corrected in the future.)
* The 20 My testing showed the 24 hour battery life is actually 22 hours. That still puts it quite a bit longer than the [[Garmin Epix]] or [[Garmin 920XT]] which also have shorter battery lives than claimed. This is good enough for shorter ultramarathons, or faster runners in 100 milers. The and the extended mode allows for 50 hours with degraded GPS accuracy.
* There is a nice display that shows the route you've taken for navigation, but there is no support for displaying a map; you need the [[Garmin Epix]] for that.
* You can use the Fenix 3 as an activity monitor, something that's common to many new sports watches. I find the Fenix 3 too big to want to sleep with it on, so I didn't use it for activity monitoring.