• To avoid interference with other equipment, network and
power cables should not be run next to or parallel to other
cables, such as radio antenna lines or power cables. If this is
not possible, the cables should be shielded with metal
conduit or a form of EMI shielding.
• The power cable should be installed as close to the battery
source as possible.
◦ If it is necessary to extend the power cable, the
appropriate gauge of wire must be used (
).
◦ Incorrectly extended runs of cable may cause the radar to
malfunction due to insufficient power transmission.
Connecting the Power Cable
WARNING
When connecting the power cable, do not remove the in-line
fuse holder. To prevent the possibility of injury or product
damage caused by fire or overheating, the appropriate fuse
must be in place as indicated in the product specifications. In
addition, connecting the power cable without the appropriate
fuse in place voids the product warranty.
1
Route the power cable from the device to the power source.
2
Connect the red wire to the positive (+) battery terminal, and
connect the black wire to the negative (-) battery terminal.
3
If you have not already done so, connect the power cable to
the device by turning the locking ring clockwise.
Power Cable Extensions
Connecting the power cable directly to the battery is
recommended. If it is necessary to extend the cable, the
appropriate gauge of wire must be used for the length of the
extension.
Distance
Wire Gauge
2 m (6.5 ft.)
16 AWG (1.31 mm²)
4 m (13 ft.)
14 AWG (2.08 mm²)
6 m (19 ft.)
12 AWG (3.31 mm²)
Connecting to a Device or to the Marine Network
You can connect the radar either directly to a radar-compatible
Garmin device or to a Garmin Marine Network to share radar
information with all connected devices.
NOTE:
Not all Garmin devices are compatible with the Garmin
Marine Network. See the installation instructions or owner's
manual provided with your device for more information.
1
Route the network cable to your compatible Garmin device.
2
If you have not already done so, install the locking rings and
o-rings on the end of the network cable.
3
Select an option:
• If the Garmin device is not compatible with the Garmin
Marine Network, connect the network cable to the port
labeled RADAR.
• If the device is compatible with the Garmin Marine
Network, connect the network cable to the port labeled
NETWORK.
Radar Operation
All functions of this radar are controlled with your Garmin
chartplotter. See the Radar section of your chartplotter's manual
for operating instructions. To download the latest manual, go to
.
Measuring the Potential Front-of-Boat Offset
The front-of-boat offset compensates for the physical location of
the radar scanner on a boat, if the radar scanner does not align
with the bow-stern axis.
1
Using a magnetic compass, take an optical bearing of a
stationary target located within viewable range.
2
Measure the target bearing on the radar.
3
If the bearing deviation is more than +/- 1°, set the front-of-
boat offset.
Setting the Front-of-Boat Offset
Before you can set the front-of-boat offset, you must measure
the potential front-of-boat offset.
The front-of-boat offset setting configured for use in one radar
mode is applied to every other radar mode and to the Radar
overlay.
1
From a Radar screen or the Radar overlay, select
Menu
>
Radar Setup
>
Installation
>
Front of Boat
.
2
Select
Up
or
Down
to adjust the offset.
Specifications
Specification
Measurement
Minimum safe operating
distance*
GMR Fantom 18
• 100 W/m² = 0.69 m (2.26 ft.)
• 10 W/m² = 2.19 m (7.19 ft.)
GMR Fantom 24
• 100 W/m² = 0.81 m (2.66 ft.)
• 10 W/m² = 2.55 m (8.37 ft.)
Compass-safe distance
.25 m (10 in.)
GMR Fantom 18 weight
6.3 kg (13.8 lb.)
GMR Fantom 24 weight
7.7 kg (17 lb.)
Temperature range
From -25 to 70°C (from -13 to 158°F)
Case material
Thermoplastic resin
Maximum antenna rotation
speed
48 RPM
Input voltage
From 10 to 32 Vdc, 2.5 A max.
Power consumption
Standby: 3 W
Transmitting: 18.1 to 24.4 W**
Fuse
7.5 A
Power output
40 W peak
RF transmit frequency
9335-9455 MHz nominal
GMR Fantom 18 beam width
5.2 degrees
GMR Fantom 24 beam width
3.7 degrees
Maximum range
48 nm
Minimum range
6 m (20 ft.)
*When it is transmitting, the radar should be located in a position
on the vessel that is at least this far from people. (IEC 60936-1,
clause 3-27.1, specifies the maximum distances from the
antenna at which radio frequency (RF) levels can be expected.)
**Power consumption when transmitting is affected by the range
setting. A greater range setting uses more power.
Detailed Dimensions
Item
GMR Fantom 18
GMR Fantom 24
Length
508.2 mm (20 in.)
645.4 mm (25
7
/
16
in.)
À
(width)
504.7 mm (19
7
/
8
in.)
642.5 mm (25
5
/
16
in.)
Á
(height)
248.3 mm (9
3
/
4
in.)
250.3 mm (9
7
/
8
in.)
3
