MX Marine / Simrad MX420 DGPS System

This is a container ship where the crew complaint that the Sperry Marine VMFT ECDIS and Radar have constantly show RAIM unsafe alarm from both DGPS no.1 and 2(MX420 with MX521 Antenna).

Go to MX Marine website and realise the following :

We have recently found that due to week rollover limitation, the date from MX421 D/GPS antenna is reset to Aug. 1, 1993. This happens when power is recycled in the unit. All other navigation information is not affected.
This week roll over issue has been fixed in the new software v4.902.
 
So follow the instruction carefully from MX521_6705.zip file to connect as follow. Download the 521-521v6705.bin into MX521A antenna via program rightarm.exe, select erase and program. After approx. 30mins of reprogramming. It shows successful on my laptop. So power down the MX521A antenna. Waited for 5mins, try to power up and reconnect all wire with Display unit MX420, found no communication between Display and Antenna. Connect back the same wire with laptop com1 setting. Found unable to reboot MX521A Antenna. This was strange as the equipment should recover by itself. For this case it was dead.
 
So finally, need to replace a new MX521A antenna with software version 6.8 and it works fine. Crew need to monitor the situation to see if the problem has fixed with the new software installed.
 
Please see attached pictures.
 
Enjoy!!