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From Fellrnr.com, Running tips
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* The cable to charge and sync the M400 is a standard micro-USB that's waterproof. Most watches use a specialist cable that's expensive to replace if lost.
=Polar M400 Cons=
[[File:PolarM400V800.jpg|right|thumb|300px|A sample of the Polar M400 GPS tracks in blue with those from the Polar V800 in red. You can see the V800 tracking to the path closely with little spacing, where the M400 is vague at best.]]
* Unlike the [[Polar V800]], the M400 has poor [[GPS Accuracy]]. While I rely on detailed measurements and statistical analysis to evaluate GPS accuracy, it's worth mentioning that on one 18 mile run the M400 has lost over a mile. This is the worst a level of error I've seen, even worse than the [[Garmin 620]] before Garmin fixed their problems with a Firmware upgrade. (I tested the M400 with version 1.4 of the firmware and the GPS accuracy is unchanged.)
** It looks like Polar are using a different GPS chipset in the M400. The V800 uses the SiRF chipset, where the M400 uses [http://www.u-blox.com/en u-blox].
