How "set_target_velocity_NED" "set_target_location" works

How the “set_target_velocity_NED” function works, I switch to GUIDED mode, but the plane just circles in one place, I would also like to know how “set_target_location” works, when I set longitude and latitude coordinates, my plane just circles around the target point gradually losing altitude, i tried to specify the height by coordinates, but it doesn’t work

I would also like to understand this. Any updates on this?

No, I haven’t found a solution yet.