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From Fellrnr.com, Running tips
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* '''How far did I run?''' This is the most basic question, and the M400 has stunningly bad GPS accuracy. I've had the M400 be out by a mile on an 18 mile run, which could really screw up your marathon training.
* '''How fast am I running?''' Knowing how fast you're running can be a nice to know, or it can 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. Without the ability to display current [[Pace From A Footpod]] while getting all other data from GPS, combined with such poor GPS accuracy, the M400 can't answer this question.
* '''Where am I? '''The M400 has no navigation featuresonly a simple "back to start" arrow, which is better than nothing, but remember this is an "as the crow flies" direct path, not a backtrack.
* '''What's my cadence? '''[[Cadence]]''' '''is one of the most critical and often overlooked aspects of running. If you get your Cadence right, many other things naturally fall into place. The M400 has limited support for a [[Footpod]], no support for Cadence from the internal accelerometer, and no Cadence alerts. It's better than nothing, but it's not great.
The M400 is not a good choice for ultrarunners, as its battery life is too short. See [[Best Running Watch#Watches for Ultrarunning| Watches for Ultrarunning]] for more details.
