Measuring The Range - Furuno FR-2105 Operator's Manual

To activate the interference rejector;
1. Press the RADAR MENU key. The following appears.
[FUNCTIONS 1]
1 TARGET TRAILS
2 TARGET ALARM
3 ORIGIN MARK
4 INDEX LINES
5
6 PULSE WIDTH
7 INT REJECT
8 ARPA
9 VIDEO PLOT
0 [FUNCTION 2]
2. Press the [7] key to select the INT REJECT option.
3. Successive presses of the key increase the effect of interference rejection, up to level 3. A
fourth press deactivates the interference rejector. Switch off the interference rejector when
no interference exists; otherwise weak targets may be lost.
Note: For stable reception of certain types of radar beacons (Racons) or SART (Search and
Rescue Radar Transponder) as required by SOLAS 1974 as amended 1988 (GMDSS), it is
recommended to turn the interference rejector off.

1.16 Measuring the Range

Use the fixed range rings to obtain a rough estimate of the range to a target. They are
concentric solid circles about own ship, or the sweep origin. The number of rings is
automatically determined by the selected range scale and their interval is displayed at the
upper-left position of the screen.
Procedure
1. Press the RADAR MENU key to display FUNCTIONS 1 menu.
2. Press the [0] key to display FUNCTIONS 2 menu.
3. Press [9] key to display BRILLIANCE 1 menu.
[BRILLIANCE 1]
1 [FUNCTIONS 2]
2 RINGS BRILL OFF/DIM/M1/M2/BRT
3 EBL BRILL DIM/M1/M2/BRT
4 VRM BRILL DIM/M1/M2/BRT
5 +CURSOR BRILL OFF/DIM/M1/M2/BRT
6 CHAR BRILL DIM/M1/M2/BRT
7 MARK BRILL DIM/M1/M2/BRT
8 TRAIL BRILL DIM/M1/M2/BRT
9 HL BRILL DIM/M/BRT
0 [BRILLIANCE 2]
1 or 2
1 to 10
-1.19-