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Revision 1.2 Appendix A – NMEA 2000
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Interfacing Page A5
9: Range Residuals “1” – The GPS100 always sets this field to a value of 0x7FFFFFFF
(data not available)
10: PRN Status "1" – This field is used to indicate the status of the first satellite in the
list. (0=Not Tracked, 1=Tracked but not used in solution, 2=Used in solution without
Differential corrections, 3=Differential Corrections available, 4=Tracked with
Differential Corrections, 5=used with Differential Corrections)
11: Reserved (4 bits) – This field is reserved by NMEA; therefore, this field always
contains a value of 0xF (the GPS100 sets all bits to a logic 1)
If Field 4 contains a value greater than one, then the group of fields 5 through 11 is repeated
until this group appears the number of times indicated by the value of Field 4.
GPS100 NMEA 2000
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Non-Periodic Data Transmitted PGNs
PGN 129538 – GNSS Control Status
The GPS100 uses this PGN to provide the GNSS common satellite receiver parameter status.
GPS100 sends this PGN only when requested by PGN 059904 (ISO Request).
Field 1: SV Elevation Mask – If the elevation of a satellite (angle above the horizon) is below
this value, the GPS100 will not use that satellite in the solution. Units are 1x10
-4
radians. The factory default for this value is 0.1309 radians , which corresponds to
7.5°.
2: PDOP Mask – If the PDOP exceeds this value, the GPS100 will indicate “No GNSS
fix” or “Dead Reckoning Mode” in PGN 129029. Units are 1x10
-2
(unitless). The
factory default is to report a fix whenever possible, regardless of PDOP.
3: PDOP Switch – If the PDOP exceeds this value, a GPS receiver will switch from 3D
to 2D mode. For the GPS100, this field always contains a value of 0x7FFF,
indicating that the GPS100 will always attempt to operate in 3D mode. Units are
1x10
-2
(unitless). The factory default is to report a fix whenever possible, regardless
of PDOP.
4: SNR Mask – If the SNR of a satellite is below this value, the GPS100 will not use
that satellite in the solution. Units are 1x10
-2
dB. The factory default is to use all
available satellites. The factory default setting for the SNR Mask is 28 dB.
5: GNSS Mode – This field is used to indicate the desired mode of operation: 0 = 1D, 1
= 2D, 2 = 3D, 3 = Auto (factory default), 4-5 = Reserved, 6 = Error, 7 = Null.
6: DGNSS Mode – This field is used to indicate the desired mode of operation of
DGNSS (0=do not use SBAS, 1 and 3=Use SBAS when available). The factory
default value for this field is 1 (use SBAS when available).
7: Position / Velocity Filter – This field always contains a value of 0x3, indicating that
the GPS100 does not allow configuration of the position / velocity filter.
8: Max Correction Age – This field always contains a value of 0xFFFF, indicating that
the GPS100 does not allow configuration of the maximum age of SBAS correction
data to be used.
9: Antenna Altitude for 2D Mode – This field is used to indicate the antenna altitude for
the GPS100 to use when operating in 2D mode in units of 1x10
-2
m. The factory
default for this field is 0.0 m.
10: Use Antenna Altitude for 2D Mode – This field is used to indicate whether the
GPS100 will use Antenna Altitude (Field 9) when operating in 2D mode. The factory