Tissot SEA-TOUCH User Manual - Page 8

SEA-TOUCH * SETTING > COMPASS > COMPASS CALIBRATION CAL 2 sec. Compass Calibration display Activate calibration mode - glass deactivated during calibration Turn the watch more than a complete revolution on a horizontal surface (e.g. a table) in an environment free from magnetic interference, at a rotation speed of around 30° per second. Total time: 20 seconds maximum a) Calibration successful - data stored b) Calibration failed - repeat calibration N S Back to compass display N W E GLOSSARY > COMPASS S Compass In compass mode, your SEA-TOUCH indicates the True North Pole, factoring in magnetic N declination. S Compass explanations The vertical lines (meridians) on the Earth converge at the True North Pole (Ng), indicating its direction. The hand of a conventional compass indicates the direction of the Magnetic North Pole (Nm). The angle (α) between these two directions Ng and Nm is known as magnetic declination. The magnetic declination value depends on your location on Earth. Furthermore, the Magnetic Ng Nm North Pole is constantly moving. So the mag- netic declination value also depends on the date. If the correct magnetic declination value (for the location and date) is set (see the setting procedure on page 7), the minutes hand of your SEA-TOUCH will point to True North (Ng). If the magnetic declination is set to 0, your SEA-TOUCH will point to Magnetic north (Nm). The magnetic decli- nation values and dates are indicated on topographic charts, or can be found using special software available on the Internet. For Switzerland: http://www-geol.unine.ch/geomagnetisme/Representation.htm For the whole world: http://www.ngdc.noaa.gov/geomag/magfield.shtml Azimuth In compass mode, your SEA-TOUCH LCD indicates the azimuth (heading) that you need to turn to. Azimuth explanations The azimuth is the horizontal angle between the direction of an object (heading) and True North and is measured in degrees from 0° to 359° (e.g.: East = 90°). In compass mode 12 o'clock represents the head- S ing given by the azimuth relative to True North. Heading N Heading N Azimuth 315° S Azimuth 315° Note 1 For a correct indication of North, it is extremely important to hold the watch as level as possible. Note 2 The compass function, like any other compass, should not be used near a metal or magnetic mass. In case of doubt, you can recalibrate your compass. Characteristics of function Accuracy: ± 8° Resolution: 2° www.tissot.ch 8/12 145_EN