Spatial FOG Reference Manual
Page 119 of 144
Version 2.3
03/05/2018
13.9.34
External Depth Packet
External Depth Packet
Packet ID
53
Length
8
Field
#
Bytes
Ofset
Data
Type
Size
Description
1
0
fp32
4
Depth (m)
2
4
fp32
4
Depth standard deviation (m)
Table 75: External depth packet
13.9.35
Geoid Height Packet
This packet provides the ofset between the WGS84 ellipsoid and the EGM96 geoid
model at the current location. This can be used to determine mean sea level height
and also depth through the following equations:
Mean Sea Level Height = Height – Geoid Height
Depth = Geoid Height – Height
Geoid Height Packet
Packet ID
54
Length
4
Field
#
Bytes
Ofset
Data
Type
Size
Description
1
0
fp32
4
Geoid Height (m)
Table 76: Geoid height packet
13.9.36
RTCM Corrections Packet
This packet is used to encapsulate RTCM diferential or RTK correction data to be sent
to Spatial FOG's internal GNSS receiver for diferential or RTK GNSS functionality.
RTCM Corrections Packet
Packet ID
55
Length
Variable, up to 255 bytes
Field
#
Bytes
Ofset
Data
Type
Size
Description
1
0
RTCM corrections data
Table 77: RTCM corrections packet
13.9.37
External Pitot Pressure Packet
This packet is used to interface a pitot tube to Spatial FOG for enhanced navigation