GPS technology has improved over the years by leaps and bounds; not only have there been significant improvements in system accuracy but advancements in materials and manufacturing have made it possible to house devices of impressive features and functionality in a small form factor. Such is the case with the Garmin 401 Fortrex.
The 401 Fortrex offers an impressive array of features. They include an altimeter, barometer, electronic compass, timer, and support for a cadence accessory and a heart rate monitor. The instrument is waterproof to IPX7 standards and offers wireless data transfer.