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TIP: If you need to specify a different antenna size, while
viewing the radar screen for the radar you want to change,
select Menu > Radar Setup > Installation > Antenna
Configuration > Antenna Size, and select the antenna size.
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.
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.
Setting a Custom Park Position
By default, the antenna is stopped perpendicular to the pedestal
when it is not spinning. You can adjust this position.
1
From the radar screen, select Menu > Radar Setup >
Installation > Antenna Configuration > Park Position.
2
Use the slider bar to adjust the position of the antenna when
stopped, and select Back.
Specifications
Specification Measurement
Pedestal weight 15.8 kg (34.8 lb.)
Antenna weight 4 ft. antenna: 5.2 kg (11.4 lb.)
6 ft. antenna: 7.3 kg (16.0 lb.)
Power cable length 15 m (49 ft. 3 in.)
Network cable length 15 m (49 ft. 3 in.)
Antenna rotation speed 24 rpm and 48 rpm
NOTE: The antenna can rotate at 48 rpm
only when in single range mode, with
MotionScope
disabled, and for range
settings of 12 nm or lower.
Maximum wind load 80 kn
Temperature range From -15 to 55°C (from 5 to 131°F)
Humidity 95% at 35°C (95°F)
Water rating IEC 60529 IPX6 (protected against
heavy seas)
Bearing accuracy 0.25 degrees
Input voltage From 10 to 32 Vdc
Fuse Radar power cable, no voltage converter:
15 A, blade-type
Radar power cable, with voltage
converter (if applicable): 30 A, blade-type
Input power GMR Fantom
54 and 56
Typical: 65 W
Maximum: 170 W
Input power GMR Fantom
124 and 126
Typical: 80 W
Max.: 185 W
Specification Measurement
Input power GMR Fantom
254 and 256
Typical: 150 W
Max.: 260 W
Compass-safe distance 300 mm (11.8 in.)
Minimum Safe Operating Distances
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.
These minimum safe distances apply for a transmitting radar
with a rotating antenna, and are much larger when the antenna
is not rotating. If rotation of the antenna is obstructed for any
reason, the transmitter will automatically turn off.
IMPORTANT: The specified 100 W/m
2
minimum distance must
be maintained between the antenna and the occupational user
and the specified 10 W/m
2
must be maintained between the
antenna and the general public. Under such configuration, the
radio frequency radiation exposure limits set forth for a
population/uncontrolled environment are satisfied.
Model 100 W/m² 50 W/m² 10 W/m²
GMR Fantom 54 0.12 m (4.72 in.) 0.17 m (6.69 in.) 0.38 m
(14.96 in.)
GMR Fantom 56 0.13 m (5.11 in.) 0.18 m (7.09 in.) 0.40 m
(15.75 in.)
GMR Fantom 124 0.19 m (7.48 in.) 0.26 m
(10.24 in.)
0.59 m
(23.23 in.)
GMR Fantom 126 0.20 m (7.87 in.) 0.28 m
(11.02 in.)
0.62 m
(24.41 in.)
GMR Fantom 254 0.27 m
(10.63 in.)
0.38 m
(14.96 in.)
0.85 m
(33.46 in.)
GMR Fantom 256 0.28 m
(11.02 in.)
0.40 m
(15.75 in.)
0.90 m
(35.43 in.)
Antenna Specifications
Specification Measurement
Type End-fed slotted waveguide
Horizontal beam width 4 ft. antenna: 1.8 degrees
6 ft. antenna: 1.25 degrees
Horizontal side lobes -23 dB within ±10 degrees of main
-30 dB outside ±10 degrees of main
Vertical beam width 22 degrees
Polarization Horizontal
Dimensions
Item Measurement Description
185.9 mm (7
5
/
16
in.) Center of rotation to the rear of the pedestal
234.7 mm (9
1
/
4
in.) Center of rotation to the front of the pedestal
86 mm (3
25
/
64
in.) Center of rotation to the rear mounting holes
114 mm (4
1
/
2
in.) Center of rotation to the front mounting
holes
200 mm (7
7
/
8
in.) Distance between the mounting holes
5
5


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