Measuring Range And Bearing Between Two Targets; Setting A Target Alarm Zone - Furuno FR-2105 Operator's Manual

1.19 Measuring Range and Bearing Between Two Targets

Press the EBL OFFSET key, and place the origin of No. 1 EBL, for example, on a target of
interest (target 1 in the illustrated example) by operating the trackball.
Turn the EBL control until the EBL passes through another target of interest (target 2).
Turn the VRM control until the range marker aligns with target 2. The active VRM readout at
the lower-right corner of the screen indicates the distance between the two targets.
You can repeat the same procedure on third and forth targets (targets 3 and 4) by using No. 2
EBL and No. 2 VRM.
Bearing is shown relative to own ship with suffix "R" or as a true bearing with suffix "T"
depending on EBL relative/true settings on the RADAR 1 menu. To return the EBL origin to
the own ship position, press the EBL OFFSET key again.
Range
350
340
marker
330
320
310
Target 2
300
No.1
290
EBL
Target 1
280
270
EBL
260
origin
250
240
230
220
210
EBL
200
190
> 140.0 R<
335.2 R
Range/bearing
between targets
1 and 2

1.20 Setting a Target Alarm Zone

CAUTION
The target alarm feature should never be relied upon as the sole means for detecting the
risk of potential collision. The operator of a ship is not relieved of the responsibility to keep
lookout for avoiding collisions, whether or not the radar is in use.
The target alarm serves to alert the navigator to targets (ships, landmasses, etc.) entering a
certain area with visual and audible alarms.
No.2
EBL
000
010
020
030
040
050
Range
060
marker
Target 4
070
R2
080
R2
090
R1
Target 3
100
No.1 VRM
110
120
No.2 VRM
130
140
150
VRM
160
170
180 > 0.50NM<
0.98NM
Range/bearing
between targets
3 and 4
-1.23-