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From Fellrnr.com, Running tips
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The [[GPS Accuracy]] for the Epix is poor at best; while it's not the worst I've seen, it's close to the bottom of the pile. Determining if it's acceptable for your running will depend on your usage.
* The Epix can give a reasonable estimate of how far you've run but the errors can add up. The amount of error depends on your route; in straight lines the Epix is okay, though even then it's worse than most other devices. However, on a twisty course it is out by around 0.75 mile on a 20 mile run. That's enough to mess up your marathon training. This translates to errors on your average pace.
* GPS watches are not accurate enough to give you a useful display of your current pace. For that you need However, the older [[Garmin 610]], [[Garmin 310XT]], or [[Garmin 910XT]] with a [[Footpod]]. Those devices Epix will allow you to get display your current pace from the footpod while using GPS for everything else. Hopefully [[Connect IQPace From A Footpod]] will allow this to be added to the Epix. (Note that the current while getting data like distance and overall pace displayed on the Epix is worse than most watches, often being out by more than a minute/mileGPS.)
* The Epix supports both GLONASS and WASS, but I have not gathered sufficient data to know if they will help accuracy (initial testing suggests not.)
If you want better [[GPS Accuracy]] than the Epix, then the [[Polar V800]] is by far the best I've tested.
Here are some of the watches that our competitors for the Epix:
* [[Garmin 920XT]]. The Epix has nearly all the features of the 920XT plus the extra mapping and navigation features. I think the Epix is well worth the extra $100 over the 920XT though you have to accept slightly worse GPS accuracy.
* Fenix 3. The [[Fenix 3 ]] falls half way between the 920XT and the Epix. It has all the features of the 920XT (including WiFi upload), plus some navigation features that might be useful to some folks. However, the main benefit of the Fenix 3 over the 920XT or Epix is probably that it looks a little more like a watch than a brick. I don't think that the Fenix 2 3 is worth the premium over the 920XT or the saving over the Epix.
* [[Garmin 620]]. The 620 has a subset of the features of the Epix and is closer to the 920XT without the Connect IQ. The 620 is a lot smaller, so I'd only go for the 620 over the Epix if size is critical.
* [[Garmin 610]]. The 610 is the predecessor to the [[Garmin 620]] and its price has dropped to make it an attractive option. While the 610 lacks many of the cool new features of the 620/920XT/Epix, it performs the core functionality you need is a runner as well as (or better than) the newer devices. When I'm pacing marathons, I still make use of the 610 with a [[Footpod]] to keep me on pace. I would highly recommend giving the Garmin 610 serious consideration, even though it's an older device.
