# Altimeter – Hamilton Watch Multi Touch Watch User Manual

## Page 11

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ALTIMETER

Indication of altitude in relation to sea level

Description of the function

In ALTIMETER mode, your watch is transformed into a
barometric altimeter and displays the altitude in
relation to the average sea level.

Explanations

Warning!

As pressure is used to calculate the altitude, the altimeter is sensitive to variations in
atmospheric pressure as the weather changes. It is not uncommon to see differences in
altitude of 100 m in one night.
The value displayed may vary without your altitude actually changing.
Change in weather = variation in pressure = modification of altitude displayed

Thus it is necessary to "calibrate" the altimeter as often as possible.

P = pressure

0m

500m

1000m

1500m

2000m

540 m

540 m

As this instrument is barometric, it calculates the altitude
according to atmospheric pressure.
As altitude increases, pressure decreases and vice versa.
Therefore, the altimeter measures the difference in
pressure and displays the altitude. It is therefore an ideal
instrument for measuring ascents. (e. g. when hiking in the
mountains).

Miscellaneous information

Technical data

Measuring range:

- 400 m to +9000 m

- 1300 ft to +29500 ft

Resolution:

1 m

3 ft

540 m

540 m

780 m

Altitude [m] / [ft]

Pressure [hPa]

Temperature [˚C]/[˚F]

0

1013.25

20 / 68

111 / 364

1000

19.3 / 66.7

988 / 3242

900

13.6 / 56.4

1949 / 6395

800

7.3 / 45.2

Note: "Calibrating" an altimeter means setting it
to the actual altitude of a known point (see the
setting procedure on page 14).
The values of actual altitudes can be found from
various sources: signs, contour lines and
benchmarks on maps.

The altitude displayed is therefore corrected automatically.
The altimeter makes a measurement every 10 seconds.

Your altimeter will not show the variations in altitude in an aircraft
as the cabin is pressurised (constant pressure).

Unit conversion: 1 metre [m] = 3.281 feet [ft]

1 foot [ft]

= 0.305 metres [m]

Average pressure, at sea level: 1013.25 hPa

Average variation in pressure and temperature depending on altitude:

G L O S S A R Y

G L O S S A R Y

Manuel Ham_GB_2e manuel.qnx 1.10.2001 16:22 Page 20