How To Select A Range Scale; How To Measure Range - Furuno FAR-2218-BB Operator's Manual

• ANT: When OFF CENTER is active, the bearing scale intervals change accordingly.
• CCRP: When the CCRP moves outside the operational display area, the bearing
scale intervals may not be displayed correctly.
STERN UP mode
The STERN UP mode rotates the HEAD UP
mode picture, relative and true bearings and
display graphics 180°. This mode is useful on
dual-radar tugboats when backing up; one ra-
dar shows HEAD UP and another shows
STERN UP. To enable the STERN UP mode,
turn on [STERN UP] on the [OPERATION]
menu.
Note: STERN UP mode is only available for
A/B-types.
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How to Select a Range Scale

The selected range scale and range ring interval are shown at the upper left corner on
the screen. When a target of interest comes closer, reduce the range scale so that it
appears in 50-90% of the display radius.
1. Place the cursor in the [RANGE] box at the top left corner of the screen.
In the above example, the range scale is set to 0.125 NM and the interval between
range rings is set to 0.025 NM.
2. Left-click to lower the range; right-click to raise the range.
You can also select the range with the RANGE key on the control unit. Press "+" to
increase the range, or press "-" to reduce the range. Press and hold a key to succes-
sively change the range upwards or downwards.
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How to Measure Range

The range to a target can be measured three ways: with the fixed range rings, with the
cursor, or with the VRM.
Use the fixed range rings to get an estimate of the range to a target. The rings are the
concentric solid circles on the display. The number of rings is automatically set by the
current range scale. The distance between the rings is the range ring interval, and the
current interval appears at the upper-left position on the screen. To measure the range
to a target with the range rings, count the number of rings between the center of the
display and the target. Check the range ring interval and estimate the distance of the
echo from the inner edge of the nearest ring.
1. OPERATIONAL OVERVIEW
Heading line
RANGE box
North marker
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