SUUNTO Vector HR - Manual (Page 54)

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is to alWays set the known reference altitude into the Wristop computer. this is the only way to get accurate altitude readings.
7.4.7 Why does the vertical ascent/descent measurement show
different readings even though I am inside and staying in the
same room?
the resolution of the vertical ascent/descent rate is m/ ft whereas the resolution of the altitude display is 5 m/0 ft, which means that
the ascent/descent rate can show movement even though you remain at the same altitude. this is caused by changes in pressure or
even vertical movement within the 5 m/0 ft resolution range.
Indoors, even small, unnoticeable air currents cause changes in air pressure. for example, if you have a window open at the other end
of your house, the air current may affect a room at the other end of the building so little that you do not notice it, but the sensors of the
Wristop computer do. Because the Wristop computer measures ascent and descent based on changes in air pressure, it interprets
these changes as vertical movement.
7.5 baRoMeTeR
7.5.1 What is the little box on the top left of the display?
It is the barometric trend indicator that shows the general direction of weather changes. the display is based on barometer measurements
for the last 6 hours.
7.5.2 does the Wristop Computer show future trends in weather
conditions?
no, the Wristop computer continually accumulates data on barometric pressure existent within a 3 to 6 hour window and displays
general barometric trends in weather based on the accumulated data.
7.5.3 What does “absolute pressure” and “relative pressure”
mean?
absolute pressure is the actual pressure in any location at any given time. relative pressure on the other hand equals the corresponding
pressure at sea level for a certain altitude that you are at. for example, if you are at an altitude of ,000 m/3,300 ft the absolute pressure
normally is around 900 mbar/6.60 inHg. the relative pressure at sea level would then be around ,03 mbar/9.90 inHg.