Garmin GPS 155XL Installation Manual page 29

4.3.4 CDI Calibration
Select the test page displaying CDI output calibration. Place the cursor on the alignment field by using
the large knob. Use the small knob to adjust the CDI needle until it is centered. Once centered, turn the
cursor off to complete the calibration process.
4.3.5 Selected Course Calibration
Select the test page displaying the selected course input. Using an extremely accurate input source, input
150° to the GPS 155XL/GNC 300XL. The input course will indicate close to 150 and a "Calib?" field
will appear in the lower right corner. Selecting the "Calib?" field will calibrate the GPS 155XL/GNC
300XL to match the input source. Verify OBS operation by checking that the bearing displayed on the
GPS 155XL/GNC 300XL is within 2° of the selected bearing. Do this for every multiple of 30° around
the OBS.
4.3.6 Approach Settings
Select the Approach Settings Test Page. Move the cursor over the approach switch field to change the
installation state. The available options are:
Appr switch:
Setting
none
instld
To verify the installation of the approach switch, the "instld" setting requires the approach switch
to be pressed to confirm its presence. The following prompt is displayed in this case: "press appr
switch to confirm" along with a "?" following "instld". When the switch press is recognized, the
prompts are cleared and the "instld" setting is confirmed.
GPS 155XL/GNC 300XL Installation Manual
190-00067-22
Description
The approach switch is not present
The approach switch is installed
NOTE
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Revision F