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.
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