Garmin Forerunner 305, Navigator staff , has a backlit LCD display type to landscape whose dimensions are respectively 3.3 cm long and 2.0 cm in height (about 1.5 inches ). The black and white monitor has a resolution of 100 x 64 pixels. Thanks to the SiRF Star III receiver can receive the satellite signals even in difficult conditions, such as between tall buildings in a street or in a forest or the trees. The device uses 20 parallel channels with continuous trace to calculate and update the position.

Garmin Forerunner 305, in 95% of cases, has a position accuracy of less than 10 meters RMS at a speed at a constant rate of 0.05 meters per second. This is subject to a decrease of accuracy up to 100 meters 2DRMS in case of implementation of Selective Availability by the U.S. Department of Defense. The maps are updated continuously, every second, the acquisition is completed in less hot of 38 seconds, cold in less than 45, highly placed in about 5 minutes.

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Garmin Forerunner 305 is equipped with internal memory and connects to your PC with free-key USB . It features an internal lithium-ion battery lasting 10 hours, which can be recharged through the USB port of your PC. It also has a heart rate monitor that allows you to continuously monitor heart rate during exercise. After some training, taking into account the pace of the user, the device is able to set personal target heart rate zone, then modifying them with the gradually increasing the degree of fitness.

Garmin Forerunner 305 is very light, with its battery weight reaches 80 grams, its dimensions are very small: 6.9 inches high, 5.3 cm wide and 1.8 cm deep. E 'commercially available in gray, red and silver, its housing is shock resistant and waterproof (IEC 529 IPX7 waterproof standards). Its work is guaranteed for temperatures between -20 and +60 degrees Celsius. The Model 305 has a built-in planar antenna. The heart rate monitor consists of a band size of 34.8 cm long, 3.6 cm wide and 1.3 inches deep for a minimum weight of 21 grams. E 'in black color, waterproof and biocompatible. It has CR2032 battery with 36-month average daily use for one hour.