NavCom Sapphire Rev.J - Manual (Page 309)

Sapphire Technical Reference Manual Rev. J
309
Examples: NMEAGGA:
$GNGGA,161611.00,3350.4771,N,11820.6248,W,2,15,0.8,8.911,M,0.0,M,10.0,2*42
High precision:
$GNGGA,161611.00,3350.477102,N,11820.624805,W,2,15,0.8,8.911,M,0.000,M,1
0.0,0402*42
The SF-3050 outputs all of these messages with the talker ID based on the current navigation
mode:
‘$GN’ = Multi-constellation and is the default mode of operation.
‘$GP’ = GPS and requires the receiver to only track and use GPS satellites; all other navigation
satellite tracking and modes must be disabled.
‘$GL’ = GLONASS and requires the receiver to only track and use GLONASS satellites; all
other navigation satellite tracking and modes must be disabled.
‘$GA’ = Galileo and requires the receiver to only track and use Galileo satellites; all other
navigation satellite tracking and modes must be disabled.
In the current software release, the $GL and $GA IDs are not available for the GGA message as
the navigation software is not tuned to provide a position solution in these singular constellation
modes.
Use StarUtil 3000 to constrain the mode to GPS only using the following commands:
[TRACKINGMODE]L1,ON,L2,ON,L2C,ON,L5,ON,WAASEGNOS,ON,STARFIRE,ON,G1,OFF,G2,OFF
[NAVMEASUSE]L1,ON,L2,ON,L2C,ON,L5,ON,WAASEGNOS,OFF,GLONASS,OFF

When the GGA message goes invalid, the time of the last known position fix is
output as is the last known position,
and the quality flag in field 6 is changed to ‘0’
or invalid. This is the correct behavior as defined by international regulatory
agencies.