BFI57 / P/N BFI57-(xxx)-(xxx)
Operation and Installation
Document-No.: 08.510.010.71e/ Revision: 3.10
14
2.4 Operation of QNH (Manually and Automatically)
The QNH can be set using three methods:
1. Manually by entering values with short presses of
.
2. Manually set tot he standard value 1013 hPa / 29.92 inHG with al
long press of
.
3. By automatical determination from comparison of the measured
static pressure with the GPS altitude. This is started with a long
press of
. The QNH will now be determined once. To
repeat the automatic determination, it has to be started again.
The GPS altitude has an inaccuracy of typ. < 80ft (25m).
The automatic QNH determination requires having a valid GPS position.
For this position the devices waits a predetermined duration. If no GPS
position could be determine during this duration, a notification is
displayed shortly, and the QNH value from before starting the failed
determination is continued to be used.
Whether the automatic QNH determination was successful, can be seen
by the updated QNH mode display:
A
The QNH has been determined automatically.
M
The QNH could not be determined automatically, or it was
set manually.
Summary of Contents for BFI57
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