Geoid Height Packet; Rtcm Corrections Packet - Advanced Navigation Certus OEM Reference Manual

Certus Reference Manual • Advanced Navigation Packet Protocol
External Depth Packet
Packet ID
Length
Read / Write
Field # Bytes Offset
1 0
2 4
Table 96: External Depth Packet

10.4.34 Geoid Height Packet

This packet provides the offset at the current location between the WGS84 ellipsoid and the EGM96 geoid
model. This can be used to determine the current height above mean sea level and also depth through the
following equations:
Height Above Mean Sea Level = WGS84 Height – Geoid Height
Depth = Geoid Height – WGS84 Height
WGS84 Height is the height at the current location in the System State packet, see
Packet
Geoid Height Packet
Packet ID
Length
Read / Write
Field # Bytes Offset
1 0
Table 97: Geoid Height Packet

10.4.35 RTCM Corrections Packet

This packet is used to encapsulate RTCM v3 correction data to be sent to the Certus internal GNSS receiver for
DGPS or RTK GNSS functionality.
RTCM Corrections Packet
Packet ID
Length
Read / Write
Field # Bytes Offset
1 0
Table 98: RTCM Corrections Packet
v2.4
Data Type Size
fp32 4
fp32 4
Data Type Size
fp32 4
Data Type Size
53
8
Read / Write
Description
Depth (m)
Depth standard deviation (m)
54
4
Read
Description
Geoid height (m)
55
Variable, up to 255 bytes
Write
Description
RTCM corrections data
Page 170
10.4.1 System State
2024-12-17