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Here's my Moxy incorrectly placed; I'd put the Moxy on my right leg with my Fenix 5X on my left wrist, which puts them too far apart and I didn't get a reading.
[[File:Fenix 5X and Moxy.jpg|center|thumb|300px|]]
While the Fenix 5X will record Muscle Oxygen Saturation data, neither the Garmin app nor the web site will display it. You have to download the .FIT file and import it into a tool like Golden Cheetah.
[[File:GC From Fenix5X SmO2.jpg|center|thumb|500px|An example workout from a [[High Intensity Interval Training]] session, showing both power and SmO2. This is the Golden Cheetah App, which is powerful, but not very user-friendly.]]
=GPS Accuracy=
I've tested the [[GPS Accuracy]] of the Fenix 5X with the latest GPS firmware, and it's possible that its accuracy will improve as the firmware matures. Based on my testing, the Fenix 5X certainly has plenty of room for improvement. At best, the GPS accuracy could be described as mediocre, and I think it's bad enough that it could significantly mess up your training. If you look at the middle, curved section, you can see that the Fenix 5X is doing particularly badly here. This is a challenging section, and reveals any weakness in a GPS watch. The right most segment with the right-angle turn is a section of the most watches do reasonably well on, but the Fenix 5X is struggling here as well. The tracks don't look too bad, you can see that the Fenix 5X is not able to calculate the distance correctly. The Fenix 5X doesn't get too badly confused going under the bridge, actually looks a little better in that area than the two Suunto watches shown for comparison. The blue lap markers are rather widely spread, again giving more evidence of poor GPS accuracy. It's possible that other versions of the Fenix 5 might have different GPS accuracy. It's possible that the plastic 935 might do a little better, but without testing it's impossible to know. (I buy all my test gear through retail channels. This allows me to be brutally honest in my reviews, as I don't need to keep the manufacturer happy in order to continue getting free samples or early access. The downside is that I'm more limited in the array of watches I can test. Therefore, it's unlikely that I will test other versions of the Fenix 5 at this point.) I've tested both the 4.20 and the 4.30 version of the GPS firmware (see below for details.)