Zeroing, Altitude Offset And Mbar Adjustment; Zeroing The Military Altitrack; Altitude Offset Or Mbar Adjustment - Larsen & Brusgaard Military ALTITRACK Instruction Manual

6 - Zeroing, Altitude Offset and mBar adjustment

6.1 Zeroing the Military ALTITRACK

The Military ALTITRACK continuously adjusts to the local elevation and the pointer is at the zero
"0" position. If the pointer is not at "0" prior to jumping, the unit has not adjusted itself to the local
elevation and it must be manually zeroed.
Turn the unit OFF and then ON.

6.2 Altitude Offset or mBar adjustment

If the elevation or barometric pressure at the DZ is different from that of the airport of take-off,
then adjust the Military ALTITRACK by activating the "Altitude Offset" mode which also enables
the "mBar adjustment" mode and is called "ACCESS".
ON THE GROUND
If the DZ elevation or the mBar pressure at the new DZ is known before entering the
airplane:
1. Press Left Front Button and release quickly
2. When "ACCESS" lights, press the button immediately and keep it pressed
3. When "ACCESS" lights again, release the button immediately
4. The present QFE is displayed in the OLED window.
Press the Right Front Button (+) or the Left Front Button (-) to set the QFE (200 to 1075 mbar)
to the absolute mbar value at the new DZ location (QFE), or move the pointed to the selected
altitude.
On the ground the selected altitude is displayed on the screen on the rear side of the altimeter as
well.
When adjusting to a negative altitude on the ground, use the inner negative scale indication or the
value displayed on the rear side of the altimeter.
Note: When performing a manual adjustment of altitude, the MilItary ALTITRACK enters
"Jump Mode" and the altitude is stored in the memory for 14 hours if no jump is made.
After 14 hours the Military ALTITRACK calibrates to the new elevation and displays "0"
The Military ALTITRACK switches OFF automatically 14 hours after the recalibration.
The altitude offset is not retained when the Military ALTITRACK is switched OFF.
IN THE AIRPLANE
If the QFE is only known after take-off or if the DZ elevation changes during the flight:
Perform "ACCESS", point 1-3 as described in paragraph 10.2 and then by means of the Right
Front Button (+) or the Left Front Button (-), set the DZ QFE in the OLED window (200 to 1075
mbar). To avoid any mistakes in this case, do not use the pointer as a reference when selecting
the new altitude.
The Military ALTITRACK exits "Altitude Offset" or "mBar adjustment" mode if no button is pressed
within 5 seconds.
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