RT_SB_INS_Vpt2_Vel_NED_1: INS Virtual Point 2 VELNED 1
RT_INS_Vpt2_Vel_NED_1: 143, 17 (0x8F1120 + unit id) (0x3D1)
Bytes 0-2: Virtual point 2 North velocity (Vel N)
Bytes 4-6: Virtual point 2 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).