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www.tissot.ch
153_EN
11/16
T-TOUCH SOLAR E81
ALTIMETER > READING
Activate glass
Altitude display according to the
favourite altitude unit system
The altitude is displayed on the digital screen for 10 hours continuously. After 10 hours, altimeter mode is deactivated, and the date is
displayed.
The favourite altitude unit system for displaying the altitude (m or ft) depends on the 12/24-h unit configuration (see page 8)
For example: Units in 24-h = altitude in metres.
: up 1 m or 3 ft
: down 1 m or 3 ft
Validate setting
Setting modeAltitude display
ALTIMETER > ALTITUDE PRESETTING
1 sec.
2 sec.
or
or
Altitude display according to the
second altitude unit system
Note 1: "Presetting" an altimeter means setting the actual altitude of a known
point (see presetting procedure on page 11). 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 pressur-
ised, 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 9.
Characteristics of function
Description of function
In altimeter mode, your T-TOUCH SOLAR E81
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 (atmos-
pheric) and relative pressure (relative to sea level)
to display the altitude. Your T-TOUCH SOLAR E81 is temperature compensated,
and you can adjust your geographic location (hemisphere and climate zone). The
altitude displayed is therefore corrected automatically.
ALTIMETER > GLOSSARY
Measurement range – 400 m to +9000 m – 1333 ft to +30,000 ft
Altimeter resolution 1 m 3 ft
Unit conversion
1 metre [m] =
3.281 feet [ft]
1 foot [ft] =
0.305 metres [m]
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.
Weather change = pressure variation = displayed altitude change
4473 m 4473 m 4473 m
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