Seatex DPS 200 Installation Manual, rev. 4 Installation
33
Field Description
hhmmss.ss UTC of position (hours, minutes, seconds).
r.rrr RMS value of the standard deviation of the range.
a.aaa Standard deviation of semi-major axis of error ellipse (meters).
b.bbb Standard deviation of semi-minor axis of error ellipse (meters).
e.eee Orientation of semi-major axis of error ellipse (degrees from true north).
l.lll Standard deviation of latitude error (meters).
y.yyy Standard deviation of longitude error (meters).
h.hhh Standard deviation of altitude error (meters).
*cc Checksum.
Table 18 GST message fields
GSV Message
The GSV message presents number of satellites (SV) in view, satellite ID numbers, elevation,
azimuth and SNR value. Four satellites maximum per transmission, additional satellite data
sent in second or third message. If multiple GPS or Glonass satellites in view, separate
sentences are used with talker ID GP to show the GPS satellites and talker ID GL to show the
Glonass satellites in view. The message is as specified in NMEA 0183 versions 2.2, 2.3 and
3.0. The message structure is as follows:
$--GSV,n,n,ss,xx,ee,aaa,nn,…….,xx,ee,aaa,nn*cc
Table 19 describes the GSV message fields.
Field Description
n Total number of messages (1-9).
n Message number (1-9).
ss Total numbers of satellites in view.
xx Satellite ID number, GPS: 1-32 (satellite number), Glonass: 65-96 (64 + satellite
number).
ee Elevation in degrees, 90º maximum.
aaa Azimuth in degrees, 000-359.
nn SNR 00-99 dB-Hz, 0 when not tracked.
….,xx,ee,aaa,nn Satellite ID, elevation, azimuth and SNR for up to four satellites.
*cc Checksum.
Table 19 GSV message fields
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