Section 18 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; clocks and watches; musical instruments; parts and accessories thereof 90 Optical, photographic, cinematographic, measuring, checking, precision, me Thereof. 90 14 Direction finding compasses; other navigational instruments and appliances 90 14 20 - Instruments and appliances for aeronautical or space navigation (other than compasses) Commodity Code Description 90 14 20 00 - Instruments and appliances for aeronautical or space navigation (other than compasses)