701 / | HD | DATA PROCESSING: VEHICLES, NAVIGATION, AND RELATIVE LOCATION |
1 | DF | VEHICLE CONTROL, GUIDANCE, OPERATION, OR INDICATION {19} |
3 | DF | .~ Aeronautical vehicle {4} |
4 | DF | .~.~ Altitude or attitude control or indication {6} |
10 | .~.~.~ Compensation for environmental conditions |