49
1400 4593 5.9 42.6
1600 5250 4.6 40.3
1800 5906 3.3 37.9
2000 6562 2.0 35.6
2400 7874 -0.6 30.9
2800 9187 -3.2 26.2
3000 9843 -4.5 23.9
3400 11155 -7.1 19.2
3800 12468 -9.7 14.5
4000 13124 -11.0 12.2
4500 14765 -14.3 6.4
5000 16405 -17.5 0.5
5500 18046 -20.8 -5.4
6000 19686 -24.0 -11.2
Table 1. Normal temperatures corresponding to different altitudes
Now the altitude measurement error caused by an abnormal temperature gradient can be approximated
as follows. If the sum of the temperature offsets from the normal temperatures
determined at two different altitudes is 1 ºC, the altitude difference calculated by
Wristop Computer is 0.2% off the real altitude difference (When using imperial units the
offset factor is 0.11% / 1 ºF). This is because the real temperatures are not always the same as the
normal temperatures. A higher than normal temperature causes the calculated altitude difference to
be smaller than the real altitude difference (your mountain ascent was actually higher). Consequently,
a lower than normal temperature causes the calculated altitude difference to be larger than the real
altitude difference (you did not ascend quite as high as displayed).
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