Altimeter Adjustment
An altimeter is an AGL device sensing air pressure and needs to be adjusted to account
for the following variable conditions:
• Barometric Pressure
• Drop Zone Altitude
Adjustment for Barometric Pressure
The capsule in the altimeter senses air pressure, therefore, an altimeter also needs to
be adjusted to account for changes in barometric pressure.
Barometric pressure can change dramatically in a short amount of time.
WARNING! - Always ensure your altimeter is
adjusted to zero to account for any changes in
barometric pressure.
Drop Zone Altitude is different than airport altitude.
In some cases, particularly on demo jumps, the drop zone elevation may differ
significantly from the elevation at the airport where you take off. In this case, a
correction must be made when adjusting your altimeter.
If possible, travel to the drop zone shortly before the jump and set your Altimaster to
zero; if not, follow this procedure to adjust your Altimaster:
1. Determine the altitude of the DZ and the airport using sectional maps or other means.
2. Calculate the altitude of the airport relative to the DZ by subtracting the DZ altitude
from the airport altitude.
3. At the airport, set the altimeter to the altitude calculated above. If the number
calculated above is a negative number, you should set your altimeter to a negative
altitude.
EXAMPLE:
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