Furuno FA - Measuring the Range; Turning Range Rings On;Off

1. RADAR OPERATION
1-34
[MARK]
1 BACK
2 OWN SHIP MARK
OFF/ON
3 STERN MARK
OFF/ON
4 INDEX LINE BEARING
REL/TRUE
5 INDEX LINE
1/2/3/6
6 INDEX LINE MODE
VERTICAL/HORIZONTAL
8 EBL OFFSET BASE
STAB GND/STAB HDG/
STAB NORTH
9 EBL CURSOR BEARING
REL/TRUE
0 RING
OFF/ON
1.20 Measuring the Range
The range to a target may be measured three ways: with the fixed range rings,
with the cursor, or with the VRM.
Use the fixed range rings to obtain a rough estimate of the range to a target.
They are the concentric solid circles about own ship, or the sweep origin. The
number of rings is automatically determined by the selected range scale and
their interval is displayed at the upper-left position of the screen. 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.
1.20.1 Turning range rings on/off
1. Roll the trackball to choose the MENU box at the right side of the screen. The
guidance box at the bottom right corner (see the illustration at the bottom of
the next page for location) now reads “DISP MAIN MENU.”
2. Push the left button to display the MAIN menu.
3. Roll the wheel to choose 2 [MARK] and then push the wheel or the left
button.
MARK menu
4. Roll the wheel to choose 0 RING and then push the wheel or the left button.
5. Roll the wheel to choose OFF or ON as appropriate and then push the wheel
or the left button.
6. Push the right button twice to close the menu.