Furuno SC-120 User Manual

APPENDIX 

 

Log 
signal 

200 pulse/nm or 400 pulse/nm (software), 0.5 A max. 

LOG/ALARM MJ7 

O 

HDG 
alarm 

Heading alarm, 0.5 A max, normal close 

HDG IN 

MJ6 

I 

Heading  Heading data in either AD10 or IEC 61162 (NMEA 

0183) format (4800 bps) is automatically received. 
Priority of IEC 61162 (NMEA 0183) sentence is 
HDT>HDG>HDM. 
The signal is selected through the menu during the 
period of internal heading sensor failure.   
VBW/VHW/VLM may be input from a current indicator.

   

 

 Each GPS receiver GPS1, GPS2, and GPS3 calculates VTG/GGA/GLL/ZDA. The 

output from HDG OUT and NAV OUT ports is one calculated by the GPS1. However, 
when the GPS1 is defective, the GPS2 replaces it. When both GPS1 and GPS2 are 
defective, the data calculated by the GPS3 is used.     

 
 

PWR Board
20P8164

MAIN Board (processor)
20P8171A

Angular Rate
Sensor Assy.
SC-303

GPS Receiver
Assy. (GPS
Receiver Module)
20-513-131
(GN-77NA-NF)

FIL Board
20P8165

Fuse