Garmin GPS 24xd Receiver and Antenna Installation Instructions - Page 8

Performing Menu-Based Calibration, Disabling the Magnetic Heading Data

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Performing Menu-Based Calibration Before you can perform menu-based calibration, you must connect the antenna to the same NMEA 2000 network as a compatible Garmin chartplotter. 1 Select Menu > Settings > Communications > NMEA 2000 Setup > Device List. 2 Select the GPS 24xd NMEA 2000 from the device list. 3 Select Review > Compass Cal. > Begin. 4 Follow the on-screen instructions until the compass calibration is complete, taking care to keep the boat as steady and level as possible. The boat should not list during calibration. When the compass calibration is complete, a value appears near the Compass Cal. setting. A value near 100 indicates the antenna was installed in a perfect magnetic environment and calibrated correctly. If the heading performance is unacceptable, and the value is closer to 0 than it is to 100, you might need to relocate the antenna and calibrate the compass again. NOTE: The antenna compass must be calibrated successfully and maintain a valid GPS position, which requires the antenna to have a clear, unobstructed view of the sky in all directions, before you proceed to Auto Heading Alignment. 5 Select Auto Heading Alignment. 6 Select Begin. 7 Follow the on-screen instructions until the magnetic heading alignment is complete. Disabling the Magnetic Heading Data If you cannot mount the antenna in an ideal location for magnetic heading and GPS performance, you can disable the magnetic heading data. Perform a factory reset (Antenna Configuration, page 11). The device still outputs GPS Course over Ground. Adjusting the Fine Heading Alignment You can adjust the Fine Heading Alignment in conjunction with Auto Heading Alignment to fine-tune the heading output (optional). NOTE: Fine heading alignment must be completed under open skies to ensure proper calibration. 1 Select Settings > Communications > NMEA 2000 Setup > Device List. 2 Select the GPS 24xd device. 3 Select Review > Fine Heading Alignment. 4 Using a landmark or a known good compass, determine the heading of your boat. 5 Adjust the heading until it matches your measurement. 6 Select Done. 8

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Performing Menu-Based Calibration
Before you can perform menu-based calibration, you must connect the antenna to the same NMEA 2000
network as a compatible Garmin chartplotter.
1
Select
Menu
>
Settings
>
Communications
>
NMEA 2000 Setup
>
Device List
.
2
Select the GPS 24xd NMEA 2000 from the device list.
3
Select
Review
>
Compass Cal.
>
Begin
.
4
Follow the on-screen instructions until the compass calibration is complete, taking care to keep the boat as
steady and level as possible.
The boat should not list during calibration.
When the compass calibration is complete, a value appears near the Compass Cal. setting. A value near
100 indicates the antenna was installed in a perfect magnetic environment and calibrated correctly. If the
heading performance is unacceptable, and the value is closer to 0 than it is to 100, you might need to
relocate the antenna and calibrate the compass again.
NOTE:
The antenna compass must be calibrated successfully and maintain a valid GPS position, which
requires the antenna to have a clear, unobstructed view of the sky in all directions, before you proceed to
Auto Heading Alignment.
5
Select
Auto Heading Alignment
.
6
Select
Begin
.
7
Follow the on-screen instructions until the magnetic heading alignment is complete.
Disabling the Magnetic Heading Data
If you cannot mount the antenna in an ideal location for magnetic heading and GPS performance, you can
disable the magnetic heading data.
Perform a factory reset (
Antenna Configuration
, page 11
).
The device still outputs GPS Course over Ground.
Adjusting the Fine Heading Alignment
You can adjust the Fine Heading Alignment in conjunction with Auto Heading Alignment to fine-tune the heading
output (optional).
NOTE:
Fine heading alignment must be completed under open skies to ensure proper calibration.
1
Select
Settings
>
Communications
>
NMEA 2000 Setup
>
Device List
.
2
Select the GPS 24xd device.
3
Select
Review
>
Fine Heading Alignment
.
4
Using a landmark or a known good compass, determine the heading of your boat.
5
Adjust the heading until it matches your measurement.
6
Select
Done
.
8