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* '''Where am I? '''The 225 has no navigation features. If you're lost, the 225 won't be much help.
* '''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. There is support for Cadence from the internal accelerometer, though I find that's not as accurate as the [[Footpod]] which it supports.
The 225 is not a good choice for ultrarunners, as its battery life is too short. See [[Shoes#Watches for Ultrarunning| Watches for Ultrarunning]] for more details. (Turning off the optical heart rate monitor only increases the battery life a couple of hours.)
[[File:Garmin 225-top.JPG|thumb|none|200px|The {{Garmin 225}}, showing the display of Heart Rate from its Optical Heart Rate Sensor.]]
=Optical Heart Rate Monitoring=