Garmin Edge 820 review: the cycling aid you'll want to hurl off a mountain

Good battery life and fancy group-tracking features can't save the Garmin Edge 820 from its irritating touchscreen and terrible navigation

Many cyclists have a love-hate relationship with their Garmin GPS navigation devices. Love, because they allow them to ride complex routes in unknown territory while collecting data about distance and speed, plus geekier pro metrics such as cadence and power with accessories. The hate sets in when they don't behave as they're supposed to.

I think I've sworn at my Garmin far more than any other device, which considering the relatively small amount of time I spend using it compared to a smartphone or laptop makes it an impressive obscenity magnet.