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This is a superb watch for GPs who are keen triathletes, writes Dr Richard Harkness.

Having entered a sprint triathlon, I was keen to find a gadget that I could use to log my progress in training. It had to have GPS tracking and be useable in all three events.

The TomTom GPS watch fits the bill. There are other sports watches, but the only one that came close was the Garmin Forerunner 910XT GPS, which is almost twice the price of the TomTom (pounds 329 versus pounds 179).