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8
With the antenna installed on the pole mount, fill the vertical
cable slot
with a marine sealant (optional).
9
Route the cable away from sources of electronic interference.
Mounting the Antenna Under a Surface
Verify that the supplied screws will not penetrate the surface
before you install the under-deck mounting bracket. If the
supplied screws are too long, use surface-appropriate screws
instead.
Because the antenna cannot acquire signals through metal, it
must be mounted under a fiberglass surface only.
1
Determine and test the location under a fiberglass surface
where you want to mount the antenna
Location, page
1).
2
Place the adhesive pads
bracket
.
3
Place the antenna in the under-deck mounting bracket.
4
Adhere the under-deck mounting bracket to the mounting
surface.
5
Secure the under-deck mounting bracket to the mounting
surface with screws.
6
Connect the cable to the antenna
7
Route the cable away from sources of electronic interference.
Connecting the Antenna
NMEA 2000 Network Connection
If you do not have an existing NMEA 2000 network, you must
install a NMEA 2000 network on your boat. For more information
on NMEA 2000, go to garmin.com/manuals/nmea_2000.
The antenna is packaged with a NMEA 2000 T-connector and a
NMEA 2000 drop cable. You will use these two components to
connect the antenna to your existing NMEA 2000 network.
NOTICE
(Testing the Mounting
on the under-deck mounting
.
If the included drop cable is not long enough, you can add a
drop cable extension up to 4 m (13 ft.). If more cable is needed,
add an extension to your NMEA 2000 backbone, based on the
NMEA 2000 guidelines.
Antenna
NMEA 2000 drop cable
NMEA 2000 T-connector
NMEA 2000 backbone
Heading Calibration
After installation is complete, you must calibrate the heading and
perform the auto heading alignment to receive magnetic heading
data.
Depending on the types of devices connected to the NMEA
2000 network, you can calibrate the antenna using either a
menu-based method or a basic method.
If you connect the antenna to a NMEA 2000 network with a
compatible Garmin chartplotter, you can perform either the basic
calibration or the menu-based calibration
Based Calibration, page
3).
If you connect the antenna to a NMEA 2000 network without a
compatible Garmin chartplotter or with a third-party device, you
must perform basic calibration instead of menu-based
calibration.
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
(Performing Menu-
3
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