One of the best seller title of GPS its coming from Garmin product, called Garmin Forerunner 205. Equipped with High Sensitivity SiRFstarIII architecture and waterproof abilty (one meter in 30 minutes). Garmin 205 Includes rechargeable lithium-ion battery and have measures 2.1 x 0.7 x 2.7 inches. Now, Forerunner 205 GPS price drop form $267 down to $166 in amazon.