Garmin Forerunner 205 Wrist Worn GPS Personal Training Device - £79.99 At Amazon

Just when you thought Garmin had cornered the market on powerful, affordable, and effective wrist-mounted GPS devices, here comes the Forerunner 205. The release of this device is a major achievement from a design and technology perspective. This isn't just marketing-speak; the Forerunner 205 is the most accurate, most reliable wrist-mounted performance and GPS tracking tool we've ever tested. Yes, it's that good. While no device this compact can do everything (yet), the 205 pushes the boundaries of what is possible from something strapped around your wrist. While the 205 doesn't offer heart rate monitoring, or connectivity with Garmin's wireless speed and cadence sensor -- for that, you'll need to step up to the Forerunner 305 -- but it's a great way to get basic GPS location and performance data.