Furuno NAVNET GD-1920C - Manual (Page 37)

2. RADAR OPERATION
2-8
2.10 Measuring the Range
You can measure the range to a radar target three ways: by the range rings, by the cursor,
and by the VRM (Variable Range Marker).
2.10.1 Measuring range by range rings
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.
To turn the range rings on, do the following:
1. If not displayed, press the
HIDE/SHOW key to show the radar soft keys.
2. Press the RADAR DISPLY soft key.
3. Press the RINGS soft key to turn the rings on and select desired brilliance.
4. Press the RETURN soft key to finish.
2.10.2 Measuring range by cursor
Operate the Trackball to place the cursor intersection on the inside edge of the radar target.
The range to the target, as well as the bearing, appears to the right of “+” at the bottom of
the display.
11.2 ˚R
11.70
nm
+
Cursor
Target
Range and bearing from
own ship to cursor
319. 9
°
M
12/
H-UP
3nm
LP
ZOOM &
D. BOX
SIGNAL
PROC.
RADAR
DISPLY
TARGET
NAV
FUNC
How to measure range to a target with the cursor