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Table 3 shows an example in which the temperature offsets are negative. This time
imperial units are used. The reference altitude is set at 3280 feet. At 9840 feet the
altitude difference is 6560 feet and Observer shows 100 feet too much (-14 ºF * 6560 ft
* 0.0011/ºF = -100 ft). Your actual altitude is thus 9740 ft.
Table 3. Example using feet and Fahrenheit.
Lower point Higher point
Set reference altitude (real altitude) 3280 ft
Displayed altitude 9840 ft
Real outside temperature +36.3 ºF +18.9 ºF
Normal (table) temperature +47.3 ºF +23.9 ºF
Temperature difference (= real - normal)-9 ºF -5 ºF
Sum of temperature offsets -9 ºF + -5 ºF = -14 ºF
CHAPTER 4 BAROMETER MODE
The Barometer provides you with:
•
An adjustable unit of measure hPa or inHg; hPa range 300 to 1100 hPa, inHg range
8.90 to 32.40;
• A resolution of 1 hPa or 0.05 inHg;
• A one hour interval measuring to estimate barometric trend;
• An automatic 4-day memory of atmospheric pressure;
• Temperature compensation (temperature does not effect the pressure within the
specified temperature range);
• A temperature range -20º to 60ºC or -5º to 140ºF;
• A temperature resolution of 1º C or F; and
• An Altimeter-Barometer use feature. Refer to Chapter 3, Altimeter-Barometer Use for
more information.