Noise Rejector; How To Measure The Range To A Target; How To Adjust Range Ring Brilliance - Furuno 1815 Operator's Manual

2.16

Noise Rejector

White noise can appear on the screen as random "marks". You can reduce this noise
as follows:
1. Press the MENU/ESC key to open the menu.
2. Select [Echo], then press the ENTER key.
3. Select [Noise Rejector], then press the ENTER key.
4. Select [Off] or [On] then press the ENTER key.
5. Press the MENU/ESC key to close the menu.
2.17

How to Measure the Range to a Target

You can measure the range to a target in three methods. the fixed range rings, the
cursor (if set to measure range and bearing), and the VRM (Variable Range Marker).
Use the fixed range rings to get a rough estimate of the range to a target. The fixed
range rings are the concentric solid circles about your ship. The number of rings
changes with the selected range scale. The interval of the range ring is displayed at
the upper-left corner of the screen. Count the number of rings between the center of
the display and the target. Check the range ring interval and measure the distance of
the echo from the nearest ring.
2.17.1

How to adjust range ring brilliance

1. Press the MENU/ESC key to open the menu.
2. Select [Brill/Color], then press the ENTER key.
3. Select [Rings Brill], then press the ENTER key.
4. Select an option, then press the ENTER key. [4] is the brightest. [Off]
turns off the range rings.
5. Press the MENU/ESC key to close the menu.
2. OPERATION
cation at the
2-15