Radar/Chart Radar User Guide
Basic Operation of Radar
65900010
3-11
A Loran-C device or an older GPS device may not provide position using
the GGA sentence. In this case the GLL sentence may be used. Quality
indicators when using the GLL sentence are shown in the table below.
GLL - system mode indicator
Indicator Description
Field
Acronym
A Autonomous
Normal
D Differential
Differential
E
Estimated dead reckoning
DR
M Manual
Manual
S Simulated
-
N Not
valid
-
Indicator values S and N are degraded values. No acronym
appears in the field but LAT/LON values change to degraded
colour (orange).
If a GLONASS device is providing position data it is likely to be configured
to send the data using the GNS sentence. Quality indicators when using
GNS are shown in the table below.
GNS - system mode indicator
Indicator Description
Field
Acronym
A Autonomous
Normal
D Differential
Differential
E
Estimated dead reckoning
DR
F
Real Time Kinematic Float
FRTK
M Manual
Manual
N Not
valid
-
P GNS
Precise
Prcs
R
Real Time Kinematic
RTK
S Simulated
-
Indicator values N and S are degraded values. No acronym
appears in the field but LAT/LON values change to degraded
colour (orange).
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