NorthStar MX500 Operator's & Installation Manual page 135

Configuration
The POS 4 screen displays the GPS/LORAN-C combined position and
navigation modes received from the $PMVX1 message (which is based on
(D)GPS if GPS is available, and based on (D)GPS calibrated LORAN-C
position if GPS is not available) from the LORAN-C receiver. The
$PMVX1 message is formatted just like the NMEA GGA message, except
that its GPS quality indicator ranges from 0-5. The GPS quality indicator is
displayed as a navigation mode on the POS 4 screen.
The POS 5 screen displays the (D)GPS calibrated LORAN-C position
received from the GLL message from the LORAN-C receiver.
The POS 6 screen displays the stand-alone (uncorrected) LORAN-C
position received from the RMA message from the LORAN-C receiver.
Version 3.0
Operator's Manual
121