Furuno MODEL 1622 - Manual (Page 17)

9
1.19 Target Trails
Target trails are simulated afterglow of target
echoes that represent their movements relative
to own ship.
3M TRAIL Trail time (3 min),
echo trail ON (TRAIL)
Figure 1-17 Target trails
Starting target trail
Press the [TRAIL] key to start the echo trail
function. "TRAIL" and the target trail time
selected appear at the top right corner on the
screen. Then, afterglow starts extending from all
targets.
Canceling target trail
Press the [TRAIL] key to erase target trails and
target trail indications.
Trail time
1. Press the [MENU] key.
2. Select TRAIL TIME (on page 2 of the menu).
3. Select target trail time desired; continuous,
30 seconds, 1, 3 or 6 min as appropriate.
4. Press the [MENU] key.
Trail brilliance
1. Press the [MENU] key.
2. Select TRAIL BRILL (on page 2 of the
menu).
3. Select HIGH or LOW as appropriate.
4. Press the [MENU] key.
1.20 Guard Alarm Zone
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 an audible alarm sounds to call
the operator’s attention. The alarm will sound on
targets entering or exiting the zone depending
on zone status after setting the alarm.
* The alarm should not be relied upon as the
sole means for detecting possible collision
situations.
* STC, FTC and GAIN controls should be
properly adjusted to be sure the alarm
system does not overlook target echoes
.
CAUTION
How guard zone type is determined
After the guard zone is set, the radar starts
searching for targets inside the guard zone for
about 8 to 12 seconds. When it finishes
searching it displays the results of the search as
G (IN) or G (OUT), at the top right corner on the
screen.
G (IN): When no target exists in the zone, "G
(IN)" appears. The audible alarm sounds to
targets which enter the guard zone.
G (OUT): When there are targets in the guard
zone, the screen shows "G (OUT)". The audible
alarm sounds on all targets which exist in the
guard zone.
(a) Inward target alarm (b) Outward target alarm
Figure 1-18 Inward and outward alarms