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[[File:Garmin-910xt.jpg|thumb|right|200px|Garmin 910XT]]The {{Garmin 910XT}} is an update to the [[Garmin 310XT]] with extra features, but it's more expensive. Probably the most useful feature for most runners is the calculation of [[Firstbeat| Training Effect]], and the altimeter. It can The 910XT has been replaced by the [[Garmin 920XT]] which offers a lot more features, but its release has also record laps when swimmingdropped the price of the 910XT. For a [[Best Running Watch| simple evaluation of a GPS watch]], I look at how well it can answer some basic questions:* '''How far did I run?''' This is the most basic question, and the Garmin 910XT has good GPS accuracy. It will give you a better at recording altitudeidea than most watches how far you've gone. * '''How fast am I running?''' Knowing how fast you're running can be a nice to know, and or it can record be vital for your training or race performance. Because of the nature of GPS, watches that rely on GPS signal alone tend to have serious problems with current pace. Thankfully, the 910XT is one of the few devices that will display current [[Heart Rate VariabilityPace From A Footpod]]while getting all other data from GPS. * '''Where am I? '''The Garmin 910XT has some basic navigation functions. ** '''Track Outline'''. There is a display of where you've run, rather like a breadcrumb trail. There are no maps, so this is just the outline on its own without any context. However, you can use it to backtrack along your path. ** '''Course Outline'''. This is an outline of a route that can be downloaded. I've found this useful during ultras or in unfamiliar cities where I've needed to know where to go. If ** '''Back To Start'''. This is a simple arrow point to your starting point, so it won't help you backtrack. ** '''Back To Waypoint'''. You can afford mark a location and use the 910XTarrow to point to it later. Again, then itthis is a simple "as the crow flies" pointer. ** '''GPS "Compass"'''. There's no magnetic compass so you have to be moving for the GPS to give you a little better than sense of direction. * '''What's my cadence? '''[[Cadence]]''' '''is one of the 310XTmost critical and often overlooked aspects of running. If you get your Cadence right, many other things naturally fall into place. (The Garmin 910XT is available with the supports [[Cadence]] via a [[Heart Rate MonitorFootpod]] as {{, but has no alerts nor does it have an internal accelerometer to estimate Cadence. For ultramarathon running the Garmin 910XT has the battery life to suffice for shorter ultras, but if you expect to be moving during the [[Second Dawn]] you may need to look elsewhere. (You can turn off GPS and use a Footpod; if you're okay with HRM}}that compromise, the 910XT will last for days.) See [[File:Garmin-910xtBest Running Watch#Watches for Ultrarunning| Watches for Ultrarunning]] for more details.jpg|thumb|none{{BuyAmazon|200pxAZID=B005SPCJ74|AZN=Garmin 910XT]]}}

* A great feature is the ability to use the optional [[Footpod]] to display your current pace while using GPS for overall pace, distance and route. Only the 910XT, 910XT and Garmin 610 can do this. * The pros 910XT has good [[GPS Accuracy]], and is better than many more recent devices. * When the 910XT starts up in the same location as the last run it will acquire satellites quickly, though if you've travelled 100s of miles/Km then it can take quite a few minutes. * The larger size allows for a larger display that's easy to read, even with four data items displayed. * The 910XT will display the 310XT route you've run, though it does not have any built in maps. You can also apply hereupload courses and display them which is great for trail ultramarathons. * There are several optional extras for the 910XT, so check including a [[Footpod]] and heart rate strap. For cyclists there is also a speed/cadence sensor and it works with various power sensors. * The 910XT will alert you when a metric is out the of range, including an alert for [[Garmin 310XT|Garmin 310XT ReviewCadence]]that is really useful and one of my favorite features.

* Some people find the 910XT to be rather large, and it is much larger than a normal watch. * The cons battery life is good for about 16-20 hours, which is enough for most people. Ultrarunners doing 100 mile or longer races will find this a problem, though it is possible to recharge it while in use. * For races where the GPS track is not important, you can extend the battery life by turning off the GPS receiver and use the [[Footpod]]. After 24 hours of running I still have most of the battery left. If you're running on a reasonable smooth surface, the 310XT also apply here[[Footpod]] is often more accurate than GPS.