Tissot SEA-TOUCH 145 - Manual (Page 8)

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SEA-TOUCH
www.tissot.ch 145_EN
Compass
In compass mode, your SEA-TOUCH indicates
the True North Pole, factoring in magnetic
declination.
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
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-
ing given by the azimuth rela-
tive to True North.
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 recali-
brate your compass.
Characteristics of function
Accuracy: ± 8°
Resolution: 2°
SETTING > COMPASS > COMPASS CALIBRATION
Activate calibration mode
– glass deactivated
during calibration
b) Calibration failed –
repeat calibration
Back to compass display
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
Compass
Calibration display
GLOSSARY > COMPASS
Heading
Azimuth
315°
Heading
Azimuth
315°
2 sec.