How To Show/Hide The Range Rings; How To Measure Range With The Variable Range Marker (Vrm) - Furuno FAR-2218-BB Operator's Manual

1. OPERATIONAL OVERVIEW
1.32.1

How to show/hide the range rings

1. Open the menu.
2. Select [3 NAV TOOLS] to show the [NAV TOOLS] menu.
3. Select [4 RANGE RINGS].
4. Select [ON] or [OFF] as appropriate, then press the ENTER MARK key.
5. Close the menu.
1.32.2

How to measure range with the variable range marker (VRM)

There are two VRMs, No. 1 and No. 2, which appear as dashed rings so that you can
distinguish them from the fixed range rings. The two VRMs can be distinguished from
each other by the different lengths of their dashes; the dashes on the No. 2 VRM are
longer.
270
260
There are two methods for measuring range with the VRMs, using the VRM key and
on-screen menu box operation.
Range to VRM
Using the VRM keys
1. Press the VRM ON key to activate the VRM1 box. Press the VRM ON key again
to activate the VRM2 box. Press the VRM ON key again to switch between active
VRMs. The currently active VRM marker is displayed as shown in the above fig-
ure.
2. Rotate the VRM knob to align the active VRM with the inner edge of the target,
then read the distance at the lower right of the screen. In the above figure, the ac-
tive VRM reads "36.44 NM".
Each VRM remains at the same geographical distance when you operate the
RANGE key or the [RANGE] box. This means that the apparent radius of the VRM
ring changes in proportion to the selected range scale.
3. Press the VRM OFF key to hide the VRMs.
1-48
350
340
330
320
310
300
290
280
250
240
230
220
210
200
190
VRM1
28.11 36.44
NM
TTG 50:00 TTG
TTG to VRM
000
010
020
Target echo
030
040
050
060
070
110
120
130
140
150
160
170
180
VRM2
Currently active VRM is highlighted.
NM
60:00
VRM1
080
090
VRM2
100