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From Fellrnr.com, Running tips
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{{DISPLAYTITLE:Polar M400 Review}}
The {{Polar M400}} is a disappointing watch, with poor GPS accuracy and limited support for [[Cadence]]. Even at its low price point it I don't think it offers good value for money. If you're after a midrange GPS watch, I'd suggest looking at the [[Garmin 610]]. While it's an older watch, it offers far more features than the M400. The Garmin 220 is more expensive, but offers better functionality.
** The accuracy you might see with the M400 on your runs may vary from my testing. If you look at the [[Detailed Statistics for GPS Running Watches| detailed statistics]] you'll see that the M400 does quite well in straight lines. This is true of nearly all GPS watches, as running in a straight line is not difficult, and even here the M400 does worse than most devices.
* Polar has added support for a [[Footpod]] with version 1.4 of firmware, but this is problematic.
** The Polar Stride Sensor is fully supported by the M400, with automatic calibration and it will display stride length as well as cadence. However, the Stride Sensor is huge and heavy when compared with modern Footpods, weighing over three times as much as a Garmin Footpod. Because of its size and weight, it requires lacing into the shoelaces, making it a real pain to move between shoes. <jfs id="B00CCASIMS" noreferb="true" n="Polar Stride Sensor"/>
** Some third party Bluetooth Footpods, like the "i-gotU" will pair with the M400, but then won't display cadence and prevent the M400 from recording any distance travelled.
** The Adidas miCoach Speed Cell will work with the M400, but it's not easy. By default it will pair with the M400, but you can't set the calibration factor nor can you set the M400 to use GPS for pace/distance. You have to pair the M400 with the Polar Speed Sensor to activate the menu items you need to configure the Adidas Footpod, which is far from ideal. However, the Adidas Footpod is then a reasonable size and provides cadence (though not stride length). <jfs id="B00FEJ7FBO" noreferb="true" n="adidas miCoach Speed Cell "/>.
