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From Fellrnr.com, Running tips
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* You need to have the new "HRM Run" for the running dynamics features. It will display Heart Rate and calculate [[Firstbeat| Training Effect]] with the older Garmin HRM, but not Ground Contact Time or Vertical Oscillation.
* The display on the Fenix 2 is a little harder to read than most other watches. The backlight compounds the problem as it is a dull red glow.
=GPS Accuracy Issues=
The Fenix 2 has some well-known GPS Accuracy issues that are mostly shared with the [[Garmin 620]], which use the MediaTek GPS chipset. I've seen three types of problem with the Fenix 2.
# Generally mediocre performance, though this obviously varies. Occasionally the Fenix 2 will be quite good, as you'd expect from a random level of error.
# The Fenix 2 records the right shape track, but offset by some distance. This does not look like a typical accuracy problem that would manifest itself randomly.
# Occasionally the Fenix 2 will report "lost satellite reception", which may well be a problem with the clock on the Fenix 2.
=Is It Just Some Watches?=
Some people are quite happy with the accuracy of their Fenix 2 or [[Garmin 620]], prompting speculation that this is a quality control issue and the problems only effect some devices. I don't believe this is the case for a number of reasons.
# I've tested 5 devices (2x Fenix 2,3x 620) that exhibit the problem. It seems remarkably unlikely that 5 out of 5 devices would have the problem. The problems with these devices seem remarkably similar, though only the Fenix 2 has the catastrophic 'lost satellite reception' problem.
# The severity of the problem depends on the situation. Running a fairly straight course with a wide open view of the sky is likely to give pretty good results.
# Awareness of the problem will depend on testing methodology. Few users gather enough data to be statistically significant, or run on a course that's certified. Even running on a certified course, it's tough to hit the tangents perfectly unless you're a front runner.
=Comparison Table=
{{:Best Running Watch-table}}
