Reference Information
LD900 Installation and Oper ations M anual
68
6.4.3 GST Sentence
The NMEA GST sentence provides error statistics of the position fix. These statistics follow from the position
calculation process.
GST Sentence Structure & Example
$GNGST, hhmmss.ss, a.aa, b.bb, c.cc, d.dddd, e.ee, f .ff, g.gg *hh
$GNGST, 024603.00, 1.47, 0.11, 0.07, 28.3688, 0.10, 0.08, 0.16 *58
GST Sentence Defined
Field
Content
GST
Estimated error in position solution
hhmmss.ss
UTC time in hours, minutes, seconds of the GPS position
a.aa
RMS value of the standard deviation of the range inputs to the navigation process. Range
inputs include pseudo-ranges and differential DGNSS corrections
b.bb
Standard deviation of semi-major axis of error ellipse (meters)
c.cc
Standard deviation of semi-minor axis of error ellipse (meters)
d.dddd
Orientation of semi-major axis of error ellipse (meters)
e.ee
Standard deviation of latitude error (meters)
f.ff
Standard deviation of longitude error (meters)
g.gg
Standard deviation of altitude error (meters)
*hh
Checksum
[CR][LF]
Sentence terminator
6.4.4 ZDA Sentence
The NMEA ZDA sentence provides time and time zone information.
ZDA Sentence Structure & Example
$GPZDA, hhmmss.ss, dd, mm, yyyy, null, null *hh
$GPZDA, 201530.00, 04, 07, 2019,
,
, *6E
ZDA Sentence Defined
Field
Content
ZDA
Time and date data
hhmmss.ss
UTC time in hours, minutes, seconds of the GPS position
dd
Day, 01 to 31
mm
Month, 01 to 12
yyyy
Year
null
Local zone hours (not available)
null
Local zone minutes (not available)
*hh
Checksum
