The Timex Ironman series has proved itself time and again. Let's take a look at the pros and cons of the latest addition, the Timex Ironman R300 GPS. Timex Ironman R300 GPS Sensors & GPS The R300 GPS has a built in optical heart rate sensor on the back. However, it will not work properly if the watch is too loose, aim for at least one finger width above your wrist bone. Additionally, a built-in accelerometer is used to track activity like steps, distance, and cadence. Although the accelerometer is mainly used for non-GPS running and walking, it can be calibrated using Treadmill mode to improve its accuracy. The GPS requires periodic software updates to achieve the best performance. Moreover, for proper recording of your outdoor workouts, you will have to wait for the GPS t...
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