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Furuno 1712 Manual

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2.15 Measuring the Range
The bearing to a target can be measured by the
range rings, by the cursor (see paragraph 2.11)
and by the VRM (Variable Range Marker).
Measuring range by the range rings
Count the number of rings between the center of
the display and the target. Check the range ring
interval at the top left-hand corner of the screen
and judge the distance of the echo from the
inner edge of the nearest ring.
Measuring range by the VRM
1. Press the [VRM] key to turn on the VRM.
2. Within 10 seconds after turning on the VRM,
that is, while "VRM" is highlighted, press
(increase radius) or (decrease radius) to
place the VRM on the inside edge of the
target.
3. Check the VRM readout at the bottom left-
hand corner on the screen.
Note: The VRM becomes stationary when the
[VRM] key is pressed a second time, or 10
seconds elapses without pressing
or .
When the VRM is stationary "VRM" is not
highlighted.
6.0
NM
2.0
VRM 2.42 NM
045.0°
2.42
NM
Target
VRM
VRM
range
Cursor
Cursor
range
Figure 2-13 How to measure range by the
cursor and VRM
To erase the VRM, press the [VRM] key until
the VRM disappears.
2.16 Measuring the Bearing
The bearing to a target can be measured by the
cursor (see paragraph 2.11) and by the EBL
(Electronic Bearing Line).
Measuring bearing by the EBL
1. Press the [EBL] key to turn on the EBL.
2. Within 10 seconds after turning on the EBL,
that is, while "EBL" is highlighted, press
(counterclockwise) or (clockwise) to bisect
the target with EBL.
3. Check the EBL readout at the bottom left-
hand corner on the screen.
Note: The EBL becomes stationary when the
[EBL] key is pressed a second time, or 10
seconds elapses without pressing
or .
When the EBL is stationary "EBL" is not
highlighted.
2.0
EBL
45.0°
045.0°
3.35
NM
Target
EBL
EBL
bearing
Cursor
Cursor
bearing
6.0 NM
Figure 2-14 Measuring bearing by
the cursor and the EBL
To erase the EBL, press the [EBL] key until the
EBL disappears.
… 17 …


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