RT_SB_INS_Vpt4_Vel_NED_1: INS Virtual Point 4 VELNED 1
RT_INS_Vpt4_Vel_NED_1: 143, 49 (0x8F3120 + unit id) (0x3F1)
Bytes 0-2: Virtual point 4 North velocity (Vel N)
Bytes 4-6: Virtual point 4 East velocity (Vel E)
NED velocities are velocities in the local North, East and Down directions at the current location.
Velocity 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).
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