Echo Stretch; Guard Alarm - Furuno 1623 Operator's Manual

5. Press ◄ to close the options window.
6. Press ▼ to choose TRAIL BRILL.
7. Press ► to open the options window.
8. Choose LOW or HIGH as appropriate.
9. Press the [MENU/ESC] key to close the
menu.

1.19 Echo Stretch

On long ranges target echoes tend to shrink
in the range direction, making them difficult to
see. On short and medium ranges such as
1.5, 3 and 6 nm range scales, the same sized
targets get smaller on screen as they
approach own ship. This is due to the
inherent property of the radiation pattern
produced by the antenna. To enhance target
video, use the echo stretch feature.
1. Press the [MENU/ESC] key to open the
User menu.
2. Choose ECHO STRETCH from page 1.
3. Press ► to open the options window.
4. Choose OFF, LOW or HIGH as
appropriate. LOW stretches echoes in the
bearing direction; HIGH stretches echoes
in the range and bearing directions. The
display shows "ES L" or "ES H" depending
on your selection.
5. Press the [MENU/ESC] key to close the
menu.
Brg dir.
Echo
Echo Stretch Echo Stretch
OFF LOW
How echo stretch works

1.20 Guard Alarm

The guard alarm allows the operator to set
the desired range and bearing for a guard
zone. When ships, islands, landmasses, etc.
violate the guard zone, the audio alarm
ES L ES H
Brg dir.
Rng
dir.
Echo Stretch
HIGH
sounds to call your attention. The alarm will
sound on targets entering or exiting the zone
depending on zone status after setting the
alarm.
NOTICE
The alarm should not be relied upon as the
*
sole means for detecting possible collision
situations.
A/C SEA, A/C RAIN, FTC and GAIN controls
*
should be properly adjusted to be sure the
alarm system does not overlook target echoes
Setting a guard zone
1. Operate the cursor pad to place the
cursor at the top left corner for the zone
and then press the [ALARM] key.
2. Operate the cursor pad to place the
cursor at the bottom right corner for the
zone and then press the [ALARM] key.
Guard
zone
to set
Mentally create
the guard zone to set.
GUARD
Guard
zone
Guard zone completed.
How to set a guard zone
10
.
Asterisk blinking
* GUARD
Drag cursor
here.
1) Drag cursor to
top left corner for
zone and press
[ALARM].
* GUARD
Drag cursor
here.
2) Drag cursor to
bottom right corner
for zone and press
[ALARM].