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Furuno 1942 Manual

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8
2.11 Erasing the Heading Line,
North Mark
The heading line or north mark (available with
gyrocompass connection) may occasionally
mask a target. To view the target, you can tem-
porarily erase the heading line and north mark
by pressing and holding down the [GAIN (HM
OFF)] control. Release the control to re-display
the marks.
Heading
line
North mark
Figure 2-6 Heading line and north mark
2.12 Measuring the Range
You can measure the range to a target three
ways: by the range rings, by the cursor, and by
the VRM (Variable Range Marker).
By range ring
Count the number of rings between the center
of the display and the target. Check the range
ring interval and judge the distance of the echo
from the inner edge of the nearest ring.
By cursor
Operate the omnipad to place the cursor inter-
section on the inside edge of the target echo,
The range to the target, as well as the bearing,
appears at the bottom of the display.
By VRM
1. Press the [EBL/VRM SELECT] key to cir-
cumscribe a VRM readout (at the bottom
right-hand corner). Each press of the key
selects the readout of EBL1, EBL2, VRM1
or VRM2 in that order.
EBL
345.6°R
23.0°R
VRM
5.3°NM
12.5°NM
Figure 2-7 Display bottom, showing location
of EBL and VRM readouts
2. Press the [EBL/VRM CONTROL] key to
enable control of the VRM by the omnipad.
3. Operate the omnipad to place the outside
edge of the VRM on the inside edge of the
target.
4. Check the VRM readout at the bottom right-
hand corner of the display to find the range
to the target.
5. To anchor the VRM, press the [EBL/VRM
CONTROL] key.
To erase the VRM, press and hold down the
[EBL/VRM CONTROL] key about two sec-
onds.
VRM1
VRM2
6.0 NM
2.0
Range
Range ring
interval
Target
Cursor
Cursor range
4.0 NM
VRM
4.0 NM
3.0 NM
VRM1
range
VRM2
range
Figure 2-8 Measuring range by the cursor,
range rings and VRM
Note: You can display the range readout of the
VRM and cursor in nautical miles, statute miles
or kilometers. For details see the next chapter.
… 19 …


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