WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
90.14 Direction flndiig compasses; other navigationd instruments and appliances. 9014.10 - Direction finding compasses 9014.20 - Instruments and appliances for aeronautical or space navigation (other than 9014.80 - Other instruments and appliances - Parts and accessories 9014.90 compasses) (I) DIRECTION FINDING COMPASSES es of direction finding compasses, fiom the simple types used by This group covers all hikers, cyclists, etc., to ose specialised for use in mining, navigation, etc., (includmg magnetic compasses, gyroscopic compasses, gyromagnetic compasses, binnacle compasses, position findmg compasses, etc.). ,X" (10 OTHER NAVIGATIONAL INSTRUMENTS AND APPLIANCES This group includes : (A) Instruments for the determination of a ship's position, such as sextants, octants, azimuths, etc. (B) Other special marine or river navigational instruments, for example : (1) Automatic pilots (Gyro pilots). These are complex units which control the ship's rudder in relation to the readings of a gyroscopic compass. (2) Course recordin apparatus. These give an accurate record of the course (and my changes of course7dmng a ship's journey. (3) Inclinometers; for measuring rolling. (4) Logs. These indicate the s eed of a ship by measuring the apparent distance covered in a gven time. Nowadays, J e s e instruments are always automatic. One type operates by means of a screw or propeller (a screw is mounted in the ship's stream and is connected to a dial on board the ship). Another type is based on the principle of differential pressure, the pressure varying according to the speed of the stream they generally comprise a Pitot tube); the &stance and speed is read on a dral on boar the ship. The heading also covers lo s inco orating a counter which records the number of times an electric circuit is iroken T . e . , the number of revolutions of the log), thus showing the distance covered by the ship. (5) Soundin leads (hand leads and winch-operated deep-sea leads), which determine the depth oft e water and the nature of the sea bed. (6) Echo sounding instruments. An audible echo returned by the sea bed is detected on board ship by a very sensitive microphone, and read on a galvanometer. (7) Ultrasonic sounding or detecting equipment, for exam le, asdic, sonar or the like, used for normal sounding o erations, for mapping e sea bed, for detecting submarines, wrecks, shoals of f?sh, etc. 5, (C) Special instruments for air navigation, such as : (I) Altimeters. A type of barometer calibrated in height units and based on the fact that atmospheric pressure decreases with altitude. (2) Air s eed indicators. These o erate b differential ressure measurements of the aircra 's slipstream, and show tr~ e spee of the aircra: in relation to the surrounding air. tl d (3) Climbin or diving speed indicators. These show the vertical speed of descent or ascent o the aircraft, by means of a differential pressure gauge. ? (4) Artificial horizons or gyro-horizons and turning and banking indicators. These are based on gyroscopic principles, the former indcating the angle of the aircraft by reference to the transversal or longitudinal axis, and the latter by reference to the vertical axis. (5) Mach-meters. These indicate the ratio between the air speed and the local speed of sound. The ratio is expressed as a " Mach number ". (6) AcceIerometers. These determine the maximum limit (not to be exceeded) of the inert forces produced by acceleration during high-speed evolutions. (7) Automatic pilots. This apparatus temporarily replaces the pilot by controlling the and flight of the aircraft in accordance with a pre-established setting etc.). It consists chiefly of direct-operated or servo-motor controls usually hydraulic motors which replace the ilot's movements), and of automatic acting apparatus (high-speed gyroscopes) whic7l co-ordinate instrument readings and the action of the servo-motors. PARTS AND ACCESSORIES Subject to the provisions of Notes 1 and 2 to this Cha ter (see the General Ex lanatory Note), parts and accessories of apparatus or appliances of this eading remain classifie here. !i This heading also excludes : (a) Radar apparatus, radio navigational aid apparatus, e.g., global positioning system (GPS) receivers, and radio remote control apparatus (heading 85.26). (b) Pantographs and eidographs, used for course plotting in navigation (heading 90.17). (c) Barometers and thermometers (including reversible thermometers for underwater research) (heading 90.25). (d) Pressure gauges, liquid level indicators and other instnrrnents of heading 90.26. (e) Revolution counters (heading 90.29). ( f ) Ammeters, voltmeters and other apparatus for measuring or checking electrical quantities of heading 90.30. (g) Marine chronometers and time-keepers (Chapter 91).
1.- This Chapter does not cover : (a) Articles of a kind used in machines, appliances or for other technical uses, of vulcanised rubber other than hard rubber (heading 40.16), of leather or of composition leather (heading 42.05) or of textile material (heading 59.11); (b) Supporting belts or other support articles of textile material, whose intended effect on the organ to be supported or held derives solely from their elasticity (for example, maternity belts, thoracic support bandages, abdominal support bandages, supports for joints or muscles) (Section XI); (c) Refractory goods of heading 69.03; ceramic wares for laboratory, chemical or other technical uses, of heading 69.09; (d) Glass mirrors, not optically worked, of heading 70.09, or mirrors of base metal or of precious metal, not being optical elements (heading 83.06 or Chapter 71); (e) Goods of heading 70.07, 70.08, 70.11, 70.14, 70.15 or 70.17; (f) Parts of general use, as defined in Note 2 to Section XV, of base metal (Section XV) or similar goods of plastics (Chapter 39); however, articles specially designed for use exclusively in implants in medical, surgical, dental or veterinary sciences are to be classified in heading 90.21; (g) Pumps incorporating measuring devices, of heading 84.13; weight-operated counting or checking machinery, or separately presented weights for balances (heading 84.23); lifting or handling machinery (headings 84.25 to 84.28); paper or paperboard cutting machines of all kinds (heading 84.41); fittings for adjusting work or tools on machine-tools or water-jet cutting machines, of heading 84.66, including fittings with optical devices for reading the scale (for example, “optical” dividing heads) but not those which are in themselves essentially optical instruments (for example, alignment telescopes); calculating machines (heading 84.70); valves or other appliances of heading 84.81; machines and apparatus (including apparatus for the projection or drawing of circuit patterns on sensitised semiconductor materials) of heading 84.86; (h) Searchlights or spotlights of a kind used for cycles or motor vehicles (heading 85.12); portable electric lamps of heading 85.13; cinematographic sound recording, reproducing or re-recording apparatus (heading 85.19); sound-heads (heading 85.22); television cameras, digital cameras and video camera recorders (heading 85.25); radar apparatus, radio navigational aid apparatus or radio remote control apparatus (heading 85.26); connectors for optical fibres, optical fibre bundles or cables (heading 85.36); numerical control apparatus of heading 85.37; sealed beam lamp units of heading 85.39; optical fibre cables of heading 85.44; (ij) Searchlights or spotlights of heading 94.05; (k) Articles of Chapter 95; (l) Monopods, bipods, tripods and similar articles, of heading 96.20; (m) Capacity measures, which are to be classified according to their constituent material; or (n) Spools, reels or similar supports (which are to be classified according to their constituent material, for example, in heading 39.23 or Section XV).