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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).

Table 2 shows an example in which the temperature offsets are positive. In this example, the reference altitude is set at 1000 m. At

Normal (table) temperature +8.5 ºC -4.5 ºC

Temperature offset (= real - normal) +9 ºC +11 ºC

Sum of temperature offsets +9 ºC + +11 ºC = 20 ºC

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