Glossary - Timex Expedition WS4 User Manual

TMX_W253_WS4_EN.qxd

GLOSSARY

This glossary provides definitions for some of the features and functions of
the watch described throughout this manual.
Altimeter: An instrument used to determine the altitude of an object with
respect to a fixed level. Typically altitude is measured with respect to sea
level.
Analog: As it relates to a watch, analog tells time with the use of hands.
Barometer: A barometer measures atmospheric pressure and can help
predict changes in weather.
Barometric Pressure: Air pressure as it relates to weather forecasts. Higher
pressure usually indicates warmer and clearer weather while lower
pressure typically indicates cloudy weather and a greater chance of precip-
itation.
Calibration: A technique to improve the accuracy of the compass, altimeter,
barometer, and weather forecast, primarily by compensating for local
conditions.
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Chronograph: The chronograph records timed segments for the duration of
your activity.
Declination: To account for the difference between true north and magnet-
ic north, a compass uses a declination angle setting. Westerly declinations
are subtracted from the computed compass heading while easterly decli-
nations are added. See the table on pages 25 and 26 for a list of declina-
tions for major world cities.
Digital: As it relates to watches, digital tells time with the use of numbers.
In Hg: In Hg stands for Inches of mercury, which is a unit for measuring air
pressure. One inch of mercury is equivalent to 33.86 millibars.
Lap: Lap time records the time or duration of individual segments of your
activity.
Magnetic North: The direction of the earth's magnetic pole and the direction
towards which a compass needle points, which differs from true north (see
below). The difference between true north and magnetic north is used to
calculate the declination angle used by the watch's compass.
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