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B GSOF Messages
142 SPSx51 Modular GPS Receivers User Guide
Velocity
This message provides velocity information. It contains the following data:
• Horizontal velocity, in meters per second
• Vertical velocity, in meters per second
• Heading, in radians, referenced to WGS-84 True North
2–9 Delta east Double meters East component of vector from base station to rover,
projected onto a plane tangent to the WGS-84 ellipsoid
at the base station
10–17 Delta north Double meters North component of tangent plane vector
18–25 Delta up Double meters Difference between ellipsoidal height of tangent plane
at base station and a parallel plane passing through
rover point
Table B.8 Velocity (Type 8 record)
Field Item Type Value Meaning
0 Output record type Char 08h Velocity data output record
1 Record length Char 0Dh Bytes in record
2 Velocity flags Char See Table B.20 Velocity status flags
3–6 Speed Float Meters per second Horizontal speed
7–10 Heading Float Radians True north heading in the WGS-84 datum
11–14 Vertical velocity Float Meters per second Vertical velocity
Table B.7 NEU Delta (Type 7 record)
Field Item Type Value Meaning