Tissot T-TOUCH EXPERT DRAGON 2012 User Manual - Page 9

T-TOUCH EXPERT * GLOSSARY > ALTIMETER Sequentiallly every 2 seconds Altitude difference display 2 sec. 2 sec. Elapsed time or stopped time Total cumulative gain in altitude during elapsed time Mean vertical speed of descent (metres/minute or feet/minute) 2 sec. 2 sec. 2 sec. Total cumulative loss in altitude during elapsed time Mean vertical speed of descent (metres/minute or feet/minute) Back: Elapsed time or stopped time 2 sec. Start Altitude difference meter Stop Altitude difference meter Reset Altitude difference meter GLOSSARY > ALTIMETER Description of function In altimeter mode, your T-TOUCH becomes a barometric altimeter, displaying the altitude relative to mean sea level. Explanations This is a barometric instrument, which calculates the altitude as a function of absolute pressure (atmospheric). As the altitude rises, pressure drops, and vice versa. So the altimeter measures the difference between absolute pressure (atmospheric) and relative pressure (relative to sea level) to display the altitude. Your T-TOUCH is temperature compensated, and you can adjust your geographic location (hemisphere and climate zone). The altitude displayed is therefore corrected automatically. This makes it the ideal instrument for measuring vertical movement with the altitude difference function (e.g. in mountain trekking). The altitude difference meter indicates the elapsed time, cumulative gains and losses in altitude and mean vertical speeds of ascent and descent. NB! Due to the use of pressure to calculate altitude, the altimeter is sensitive to variations in atmospheric pressure in weather changes. It is not uncommon to observe altitude differences of 100 m in a night. So the value displayed may vary without the altitude having actually changed. 4473 m 4473 m 4473 m Weather change = pressure variation = displayed altitude change We advise you to stop the altitude difference meter during rest times and then restart it, in order to obtain more accurate results. Note 1: "Presetting" an altimeter means setting the actual altitude of a known point (see presetting procedure on page 8). The actual altitude values are indicated on various media: signposts, contour lines and spot heights on maps. The altitude "presetting" is in line with relative atmospheric pressure. Note 2: In an airliner, since the cabin is pressurised, your altimeter will not indicate an accurate altitude. Note 3: To optimise the accuracy of your altimeter, you are advised to select the climate zone, see page 6. Characteristics of function Measurement range Altimeter resolution Unit conversion Altitude difference meter max. measurement time Maximum altitude difference Altitude difference meter resolution Maximum vertical speed Minimum vertical speed Vertical speed resolution Minimum vertical movement - 400 m to +9000 m 1 m 1 metre [m] = 3.281 feet [ft] - 1333 ft to +30,000 ft 3 ft 1 foot [ft] = 0.305 metres [m] 9 days 23 hours 59 minutes +/- 30,000 m +/- 99,000 ft 1 m 3 ft 4999 m/min 16,401 ft/min (appr. 300 km/h) (appr. 187.5 mph) 5 m/min (appr. 0.3 km/h) 16.4 ft/min (appr. 0.2 mph) 1 m/min 3 ft/min 5 m 16 ft Minimum time of movement 5 mins www.tissot.ch 9/14 141_EN