4. Operation 25 
 
 
◎Each Alert and Alert Display (Screen Display) list 
 
No. 
Alert Display   
(Screen Display) 
Alert  Primary  Description 
01 
DEPTH1 
Primary depth alert 
Alarm 
Depth becomes below 
the set value 
02 
DEPTH2 
Secondary depth alert 
Alarm 
Depth becomes below 
the set value 
03 
DEPTH1 
Primary sea bottom lost 
Warning 
Sea bottom tracking is 
unavailable 
04 
DEPTH2 
Secondary sea bottom lost 
Warning 
Sea bottom tracking is 
unavailable 
05 
TX1(LEVEL) 
Primary transmission abnormality 
Warning 
Transmission level is low 
06 
RX1(LEVEL) 
Primary receiving abnormality 
Warning 
Receiving level is low 
07 
RX1(BUBBLE) 
Primary bubbling 
Warning 
Depth is temporally lost 
08 
TX2(LEVEL) 
Secondary transmission abnormality 
Warning 
Transmission level is low 
09 
RX2(LEVEL) 
Secondary receiving abnormality 
Warning 
Receiving level is low 
10 
RX2(BUBBLE) 
Secondary bubbling 
Warning 
Depth is temporally lost 
11 
PRINT* 1 
No thermal paper* 1 
Warning 
Printer paper is ended 
12 
PRINT(DATA) * 1 
Printer communication abnormality* 1 
Warning 
Printer data 
communication error 
* 1 Alerts of No. 11 and No. 12 occur only when "build-in, NKG-91, NKG-901" is selected. 
This alert No. is also used in Alert Log function. (Refer to page 48) 
 
The Alert Icons are as follows. 
 
Active –unacknowledged alarm 
 
Active –silenced alarm 
 
Active –acknowledged alarm 
 
Rectified –unacknowledged alarm  
 
 
Active –unacknowledged warning 
 
Active –silenced warning 
 
Active –acknowledged warning 
 
Rectified –unacknowledged warning