return GPS velocity vector

def gps_velocity_old(GPS_RAW_INT):
    '''return GPS velocity vector'''
    return Vector3(GPS_RAW_INT.vel*0.01*cos(radians(GPS_RAW_INT.cog*0.01)),
                   GPS_RAW_INT.vel*0.01*sin(radians(GPS_RAW_INT.cog*0.01)), 0)