SUUNTO Advizor - Manual (Page 55)

49
First, if you mean will Wristop Computer show accurate altitude information when ascending back to 8,000 ft after having
descended to 3,000 ft from 5,000 ft, the answer is yes if the barometric pressure hasn’t been affected by weather changes.
Since the altitude is shown based on the atmospheric pressure 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 you’ve
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
at 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.
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 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