GPS
24xd
wire
Color
GPS 24xd
wire function
Chartplotter
wire
Chartplotter
wire function
Red
Power (1 A
fuse)
Power
Black
Ground
Ground
White/Orange
(ground)
Rx/B (In -)
White
Rx/A (In +)
Tx/A (Out +)
Gray
Tx/A (Out +)
Rx/A (In +)
White/Red
(unconnected)
Tx/B (Out -)
Orange
Accessory on
Accessory on
NMEA 0183 Wiring for Two-Way Communication
Item
Description
Antenna
1 Amp fuse
Power source
Garmin NMEA 0183 compatible chartplotter
GPS 24xd Wire Color
Chartplotter
Wire
Chartplotter
Wire Function
Red
Power (+)
Black
Ground (-)
White/Orange
(ground)
Tx/B (Out -)
White
Tx/A (Out +)
Gray
Rx/A (In +)
White/Red
(unconnected)
Rx/B (In -)
Orange
Accessory on
NMEA 0183 Connection Exceptions
CAUTION
The orange accessory on wire is used when connecting the
antenna to a Garmin chartplotter, or other NMEA 0183 device
that has a defined accessory signal wire. If you are connecting
the antenna to a device that does not have an accessory signal
wire, connect the orange wire from the antenna to ground and
connect the antenna power wire to the ignition or install an in-
line switch. The antenna will drain the battery of the boat if it is
not switched.
• If your NMEA 0183 compliant device has only one receiving
wire (Rx), connect it to the gray wire (Tx/A (Out +)) from the
antenna, and leave the white/red wire (Tx/B (Out -) ) from the
antenna unconnected.
• If your NMEA 0183 compliant device has only one
transmitting wire (Tx), connect it to the white wire (Rx/A (In
+)) from the antenna, and connect the white/orange wire
(Rx/B (In -)) from the antenna to ground.
Heading Calibration
After installation is complete, you must calibrate the heading and
perform the auto heading alignment to receive magnetic heading
data.
Performing Basic Calibration
You must be able to view heading data from the antenna on a
connected chartplotter or marine instrument before you can
perform basic calibration. If you cannot view heading data on
your connected display, check the power connections and the
display's NMEA 0183 settings.
When performing basic calibration, you first calibrate the
compass and then align the heading in one continuous
procedure.
NOTE:
The boat must be able to reach a cruising speed of at
least 6.4 km/h (4 mph) to perform the heading alignment.
1
Drive the boat to a location with calm, open water.
2
Set the display to view heading data from the connected
antenna.
NOTE:
You must not use GPS Course Over Ground (COG)
to perform basic calibration.
3
Disconnect power from the antenna.
4
Wait while the boat becomes level and stationary.
5
Turn on power to the antenna, and wait until the heading data
appears on the display .
NOTE:
If you are performing the first basic calibration after a
factory reset, the heading is blank.
6
Within three minutes, complete two full, slow, tight circles ,
taking care to keep the boat as steady and level as possible.
The boat should not list during calibration.
When the antenna is prepared to calibrate the compass, the
heading data disappears from the display
You may receive an error message that the heading was lost.
You can ignore this message.
7
Continue turning in the same direction at the same speed
for approximately 1
1
/
2
rotations until the heading data
appears .
4
