Furuno 2837S - Manual (Page 57)

3. SETTING AND ADJUSTMENT
3-17
Note 2: In the dual radar display, a guard zone set on the main radar is also accommodated on
the external radar. When the position of the antennas for the main and external radars
is different and the No. 2 guard zone is set on a close-in range, the on-screen guard
zone may be shifted slightly from both the main radar antenna reference and external
radar antenna reference. Accordingly, on the dual radar display, the actual guard zone
area may be shifted slightly. For example, the guard alarm sounds against a target
which has almost entered the guard zone. The further the range the smaller the shift;
however, there is little shift with the No.1 guard zone (3-6 mile range, fixed). Further, do
not set a guard zone such that it straddles a boundary line of the dual radar sector.
A guard zone cannot be set while the dual radar display is active. Set a zone before activating
the dual radar display.
1. Open the INITIALIZE menu. See page 3-4.
2. Press the [3] key to show the SCANNER menu.
3. Select 9 [DUAL RADAR] and push the left button.
1 BACK
2 DUAL RADAR
OFF/ COMBINE
3 COMBINE MODE
OWN/EXT
4 COMBINE SECTOR
START 000
°
ANGLE 000
°
5 COMBINE RANGE
START 00.00NM
LENGTH 00.00NM
6 EXT RADAR
1/2/3/4
[DUAL RADAR]
4. Select 2 [DUAL RADAR] and push the left button.
5. Select OFF or COMBINE as appropriate and push the left button. For COMBINE, the
ANTENNA box at the top left-hand side becomes gray.
OFF:
Turn off the dual radar display.
COMBINE: Display a part of the external radar image in the window on the main radar.