Heading Line; Interference Rejector; Noise Rejector; Echo Trail, Trail Brilliance - Furuno 1623 Operator's Manual

1.15 Heading Line

The heading line indicates the ship's heading
and it is the solid line which appears at zero
degrees on the bearing scale.
To temporarily erase the heading line to look
at targets existing dead ahead of own ship,
do the following:
1. Press the [MENU/ESC] key to open the
User menu.
2. Choose HDG LINE OFF from page 2.
3. Press ► to turn the heading line off. The
line stays off while ► is pressed.
4. Press the [MENU/ESC] key to close the
menu.

1.16 Interference Rejector

Mutual radar interference may occur in the
vicinity of another shipborne radar operating
in the same frequency band (9 GHz). It is
seen on the screen as a number of bright
spikes either in irregular patterns or in the
form of usually curved spoke-like dotted lines
extending from the center to the edge of the
picture. This type of interference can be
reduced by activating the interference rejector
circuit. "IR" and the rejection level indicator "L,
M or H" appear at the top right corner when
the interference rejector circuit is on.
Appearance of interference
Turn off the interference rejector when no
interference exists, to avoid missing small
targets.
1. Press the [MENU/ESC] key to open the
User menu.
2. Choose INT REJECTION from page 1.
3. Press ► to open the options window.
4. Choose OFF, LOW, MED or HIGH as
appropriate.
5. Press the [MENU/ESC] key to finish.

1.17 Noise Rejector

The noise rejector suppresses white noise,
which appears on the screen as many dots
scattered randomly over the display.
1. Press the [MENU/ESC] key to open the
User menu.
2. Choose NOISE REJECTION from page 1.
3. Press ► to open the options window.
4. Choose OFF, LOW, MED or HIGH as
appropriate.
5. Press the [MENU/ESC] key to close the
menu.

1.18 Echo Trail, Trail Brilliance

Echo trails are simulated afterglow of target
echoes that represent their movements
relative to own ship.
3M TRAIL
1. Press the [MENU/ESC] key to open the
User menu.
2. Choose ECHO TRAIL from page 3.
3. Press ► to open the options window.
Echo trail options
4. Choose appropriate time.
9
Trail time (3 min)
Echo trail
Echo trails
OFF
30sec
1min
3min
6min
CONT