Furuno 1834C-BB User Manual

2. RADAR OPERATION 

 When the radar range is less than the guard zone range “G1 (G2) IN” or “G1 (G2) 

OUT” changes to “G1 (G2) ***.” The guard alarm function is not available while this 
indication appears. 
 
Note 2:

 If the network radar is set to standby while the guard alarm is active, the guard 

alarm is cancelled. The guard alarm is redisplayed when the radar is set to transmit again. 
 

Any radar target violating the guard zone will flash, the audio alarm sounds, and the alarm 
icon appears in red. Additionally the message “TARGET ENTERED INTO 
GUARD1(GUARD2)” or “TARGET LEFT FROM GUARD1(GUARD2)” is displayed at the 
bottom of the screen. Press the CLEAR key to silence the alarm. 

 

1. Press the ALARM key to show the ALARM menu. 
2.  Press the B: ERASE GUARD1 or D: ERASE GUARD2 soft key as appropriate. 
3.  Press the E: RETURN soft key to finish. 

 
 

The watchman function periodically transmits radar pulses for one minute to check for 
targets in a guard zone. If a target is found in the zone, watchman is cancelled, the audio 
alarm sounds and the radar continues transmitting. If no target is found the radar goes into 
standby for the number of minutes specified on the RADAR DISPLAY SETUP menu. This 
feature is useful when you do not need the radar’s function continuously but want to be 
alerted to radar targets in a specific area. “WTCH” appears at the top left corner when 
Watchman is active. 

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.

1.  Set a guard zone. (See the paragraph 2.22.) 
2.  If not displayed, press the HIDE/SHOW key to display the radar soft keys. 
3.  Press the C: NAV FUNC soft key. 
4.  Press the A: W. MAN ON/OFF soft key to select ON or OFF as appropriate. 
5.  Press the E: RETURN soft key to finish.