11.4.32 External Depth Packet
External Depth is the measured distance below Mean Sea Level
External Depth Packet
Packet ID
53
Length
8
Read / Write
Read / Write
Field #
Bytes Offset
Data Type
Size
Description
1
0
fp32
4
Depth (m)
2
4
fp32
4
Depth standard deviation (m)
Table 94: External Depth Packet
11.4.33 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
Geoid Height Packet
Packet ID
54
Length
4
Read / Write
Read
Field #
Bytes Offset
Data Type
Size
Description
1
0
fp32
4
Geoid height (m)
Table 95: Geoid Height Packet
11.4.34 RTCM Corrections Packet
This packet is used to encapsulate RTCM v3 correction data to be sent to the Boreas internal GNSS receiver for
DGPS or RTK GNSS functionality.
RTCM Corrections Packet
Packet ID
55
Length
Variable, up to 255 bytes
Read / Write
Write
Field #
Bytes Offset
Data Type
Size
Description
1
0
RTCM corrections data
Table 96: RTCM Corrections Packet
v1.2
Page 139
11 Oct 2022
Boreas Reference Manual • Advanced Navigation Packet Protocol