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B     GSOF Messages

142     SPSx51 Modular GPS Receivers User Guide

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)

0

Output record type Char

08h

Velocity data output record

1

Record length

Char

0Dh

Bytes in record

2

Velocity flags

Char

See 

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)