NavCom Sapphire Rev.J - Manual (Page 312)

Sapphire Technical Reference Manual Rev. J
312
Note: If no geoid is loaded, geoidal separation will be
reported as 0.
F11 Age Time since last dGPS data was received, in seconds.
F12 ID
Reference station ID number (0000 – 1023).
In StarFire mode this is the StarFire satellite ID.
F13 Status
Navigational Status Indicator (see note below)
S = Safe.
C = Caution.
U = Unsafe.
V = Not Valid.
F14 *CRC Checksum

The Navigational Status Indicator (F13) is determined by comparing the Horizontal
Position Error to the Selected Accuracy Level. The Selected Accuracy Level value
is configured by means of the [CONFIGGFA] command and is set to 10 meters by
default. The Horizontal Position Error is calculated as part of the RAIM data which
is reported in the [NMEARRE] message (not an NMEA message). For example, in
RTK mode, this error typically has a value of 0.1 meters.
 If the Horizontal Position Error is less than or equal to the Selected Accuracy Level,
the Navigational Status Indicator is set to “S” (Safe).
 If the Horizontal Position Error is greater than or equal to the Selected Accuracy
Level, the Navigational Status Indicator is set to “U” (Unsafe).
 If there is no valid Horizontal Position Error (no RAIM data), the Navigational
Status Indicator is set to “C” (Caution).
 If there is no Nav Solution, the Navigational Status Indicator is set to “V” (Not
Valid).
Example:
Tracking both GPS and GLONASS satellites and both in Precise mode:
$GNGNS,232439.00,3350.4708,N,11820.6172,W,PP,16,0.8,45.0,-36.0,,,S*28
$GPGNS,232439.00,,,,,,08,,,,6.0,0402,S*1B
$GLGNS,232439.00,,,,,,08,,,,6.0,0402,S*07
Tracking both GPS and GLONASS in Autonomous mode (note: one GNGNS message):
$GNGNS,233839.00,3350.4710,N,11820.6173,W,AA,16,0.7,43.6,-36.0,,,S*22
Tracking only GPS satellites in Precise mode:
$GPGNS,232744.00,3350.4708,N,11820.6172,W,PN,08,1.3,45.0,-36.0,6.0,0402,S*0A
Tracking only GPS satellites in Autonomous mode:
$GPGNS,232939.00,3350.4708,N,11820.6172,W,AN,08,1.2,44.8,-36.0,,,U*3F
Tracking GPS and GLONASS satellites in Differential mode:
$GNGNS,233459.00,3350.4709,N,11820.6173,W,DD,16,1.2,44.1,-36.0,,,S*24