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reading it will be affected by pressure changes. But if the conditions are the same, and the reference
altitude is set, the unit will show quite accurate readings.
Second, if what you mean is how the Wristop Computer calculates the information shown in the logbook,
this is what it does: for the total ascent during the log (the logbook recording has been activated by the
user when starting out) it calculates the ascent from 3,000 ft to 8,000 ft, i.e. total ascent has been
5,000ft. For the descent it calculates the descent from 5,000 ft to 3,000 ft, i.e. total descent 2,000 ft.
Third, if thinking about the difference measurement function and how this is affected by the example
situation, the Wristop Computer will show you the absolute difference between 5,000 ft and 8,000 ft
(beginning and end). The fact that youve been down to 3,000 ft in-between does not have an impact on
the absolute vertical altitude difference between starting point and finish.
Last, the automatic 24-hour memory will show this information in the following way: Say you are
starting out at 5,000 ft at noon, and then it takes you 2 hours to descend to 3,000 ft, and another five
hours to reach 8,000 ft. The scrollable displays in the 24-hour memory shows you the altitude 5,000 ft at
12:00 am, e.g.4,000 ft at 1 p.m., 3,000 ft at 2 p.m., e.g. 4,000 ft 3 p.m., 5,000 ft at 4 p.m., 6,000 ft at 5
p.m., 7,000 ft at 6 p.m. and then 8,000 ft at 7 p.m.
These are the different cases in which the example situation will affect the readings of the Wristop
Computer. Most important to remember is to ALWAYS set the known reference altitude into the Wristop
Computer. This is the only way to get accurate altitude readings.
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 1 m/1 ft whereas the resolution of the altitude
display is 5 m/10 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/10 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.
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