Setting Watchman Stand-By Interval; Suppressing Second-Trace Echoes - Furuno 1824C-BB Operator's Manual

2. RADAR OPERATION
Note: When the watchman is activated and no guard zone is active, the message "PLEASE
SET GUARD ZONE. PUSH ANY KEY TO CONTINUE." appears. Press any key and then
set a guard zone.

2.23.3 Setting watchman stand-by interval

The watchman standby interval, that is, the number of minutes the radar is in standby, can
be set to 5, 10 or 20 minutes as follows:
1. Press the MENU key.
2. Press the A: RADAR DISPLAY SETUP soft key.
3. Select WATCHMAN TIME, then press the A: EDIT soft key.
WATCHMAN TIME
5 minutes
10 minutes
20 minutes
Watchman window
4. Select time desired, then press the C: ENTER soft key.
5. Press the MENU key to close the menu.

2.24 Suppressing Second-trace Echoes

In certain situations, echoes from very distance targets may appear as false echoes
(second-trace echoes) on the screen. This occurs when the return echo is received one
transmission cycle later, or after a next radar pulse has been transmitted.
To activate or deactivate the second-trace echo rejector do the following:
1. Press the MENU key.
2. Press the A: RADAR DISPLAY SETUP soft key.
3. Use the Trackball to select 2ND ECHO REJECTION, then press the A: EDIT soft key.
4. Choose ON or OFF as appropriate, then press the C: ENTER soft key.
5. Press the MENU key to close the menu.
2-24
Tx repetition
Actual range
Second-trace echoes
Second-trace
echo
False echo
range