Guard zone keep flashing

[linhkienbodam]

I am using Furuno 1833C + PG500 heading sensor. My guard alarm zone keep flashing on overlay page . How can I stop it? Thank you

 

[Johnny Electron]

The video didn't make it through but if running ARPA, you must run AD10 heading not NMEA heading. The ARP11 board requires AD10 to function.