Furuno 1715 - Manual (Page 20)

1. OPERATION
12
1.21 Watchman
How watchman works
Watchman transmits the radar for one minute
to check if a target has entered or exited the
guard zone from the previous transmission. If
no change is found, the radar goes into
stand-by for the number of minutes set for the
watchman feature. If change is found, the
audio alarm sounds, watchman is canceled
and the radar transmits. This feature is useful
for extending the life of the magnetron.
ST-BY
5,10
or
20 min
Tx
1 min
Tx
1 min
Watchman
starts
5,10
or
20 min
ST-BY
* *
* Beeps emitted just before radar transmits.
How watchman works
Setting watchman stand-by interval
The watchman stand-by interval, that is, the
number of minutes the radar is in standby,
can be set to 5, 10 or 20 minutes as follows:
1. Set a 360° guard zone referring to
paragraph 1.20.
2. Press the [MENU/ESC] key to open the
User menu.
3. Press ▲ or ▼ to choose WATCHMAN
TIME from page 2.
4. Press ► to open the options window.
OFF
5 min
10 min
20 min
Watchman time options
5. Press ▲ or ▼ to choose appropriate time
out, that is, the amount of time the radar
waits in standby, among 5, 10 and 20
minutes.
6. Press the [MENU/ESC] key to close the
menu.
Note 1: To turn off the watchman feature,
choose OFF at step 5.
Note 2: You cannot put the radar in stand-by
when the radar is transmitting for the
watchman feature.
1.22 Suppressing Heavy Rain
Clutter
In adverse weather, clouds, rain or snow
produce spray-like spurious echoes which
impair target detection over all ranges. These
echoes can be suppressed by turning on the
FTC (Fast Time Constant). FTC works by
splitting up these unwanted echoes into a
speckled pattern, making recognition of solid
targets easier.
1. Press the [MENU/ESC] key.
2. Press ▲ or ▼ to choose FTC from page
1.
3. Press ► to open the options window.
4. Press ▲ or ▼ to choose OFF or ON as
appropriate.
5. Press the [MENU/ESC] key to close the
menu.
“FTC” appears at the top right corner when
the FTC is active.
1.23 Panel Backlighting
You may adjust panel backlighting as follows:
1. Press the [MENU/ESC] key to open the
User menu.
2. Press ▼ to choose SYSTEM MENU.
3. Press ▲ or ▼ to choose PANEL DIMMER
from page 1.
4. Press ► to open the options window.
5. Choose OFF, LOW, MEDIUM or HIGH as
appropriate.
6. Press the [MENU/ESC] key twice to close
the menu.