GNSS Compass Reference Manual
Page 68 of 85
Version 1.1
13/01/2021
10.10.30
Running Time Packet
Running Time Packet
Packet ID
49
Length
8
Field #
Bytes
Offset
Data
Type
Size
Description
1
0
u32
4
Running time seconds
2
4
u32
4
Microseconds
Table 74: Running time packet
10.10.31
Local Magnetic Field Packet
Local Magnetic Field Packet
Packet ID
50
Length
12
Field #
Bytes
Offset
Data
Type
Size
Description
1
0
fp32
4
Local magnetic field X (mG)
2
4
fp32
4
Local magnetic field Y (mG)
3
8
fp32
4
Local magnetic field Z (mG)
Table 75: Local magnetic field packet
10.10.32
External Time Packet
External Time Packet
Packet ID
52
Length
8
Field #
Bytes
Offset
Data
Type
Size
Description
1
0
u32
4
Unix time seconds, see section 10.10.1.4
2
4
u32
4
Microseconds, see section 10.10.1.5
Table 76: External time packet
10.10.33
Geoid Height Packet
This packet provides the offset 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
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