RT_GPS_Vel_NED_1 GPS North and East velocity
RT_GPS_Vel_NED_1: 140, 17 (0x8C1120 + unit id) (0x311)
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Byte 0: Validity
Byte 1: Accuracy (N & E) (m/s)
Bytes 2-4: GPS Velocity N (m/s)
Bytes 5-7: GPS Velocity E (m/s)
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NED velocities are velocities in the local North, East and Down directions at the current location.
Accuracy resolution is m/s * 0.1
Speed resolution is m/s * 1e-4
NED velocity has components in the local North, East and Down directions. E.g. an NED velocity of 2, 2, 0 implies that the vehicle has a velocity component in the North direction of 2m/s and a velocity component in the East direction of 2m/s, and no vertical velocity component (the vehicle is travelling exactly on the flat). In this case, the vehicle is heading NE, and would have a speed of 2.83m/s (square root of 2*2 + 2*2 + 0*0).
These measurements are from GPS data only.
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