How can I test if my NAV4 is receiving input from my GPS unit?

Raw NMEA data sent from the GPS can be printed by entering NMEA test mode. This causes the NAV4 to output all received NMEA data. To place the NAV4 in NMEA test mode push the 'Y' button 3 times in quick succession (NAV4 starts to tick). The NAV4 will print a list of all the NMEA data that it can use. Cancel the test mode by again pushing the 'Y' button 3 times in quick succession.

My NAV4 has output a large printout entitled...

The NAV4 buffer fault report is a standard report produced by the NAV4 if the print buffer overflows. This is not a fatal error report and you have no need to worry. The buffer fault report indicates that your NAV4 has noticed a printing error when recalling a NAVTEX message from memory.

This type of report is however rather unusual, if a GPS or instrument system is connected it could also be related to the amount of NMEA data sent to the NAV4.


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