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  1. All-Round Light‏‎ (4 categories)
  2. Diversity reception‏‎ (4 categories)
  3. Track‏‎ (4 categories)
  4. Isolated Danger Mark (or Buoy) (G.B.)‏‎ (4 categories)
  5. Photometer‏‎ (4 categories)
  6. Approaches‏‎ (4 categories)
  7. Cathodic protection/es‏‎ (4 categories)
  8. Global Navigation Satellite System (GNSS)‏‎ (4 categories)
  9. Aural masking‏‎ (4 categories)
  10. Modulator‏‎ (4 categories)
  11. Lateral deviation error‏‎ (4 categories)
  12. Position line‏‎ (4 categories)
  13. Single-Flashing Light‏‎ (4 categories)
  14. Projector Lamp (G.B.)‏‎ (4 categories)
  15. Load factor‏‎ (4 categories)
  16. Binary code‏‎ (4 categories)
  17. Flame Arc Lamp‏‎ (4 categories)
  18. Optical Density‏‎ (4 categories)
  19. Alternating Light‏‎ (4 categories)
  20. Correlated Colour Temperature‏‎ (4 categories)
  21. Intermittent duty‏‎ (4 categories)
  22. Buoy lantern/es‏‎ (4 categories)
  23. Starboard Hand Mark (or Buoy)‏‎ (4 categories)
  24. Angle section‏‎ (4 categories)
  25. ELoran‏‎ (4 categories)
  26. Mean power‏‎ (4 categories)
  27. Jetting‏‎ (4 categories)
  28. Articulated beacon‏‎ (4 categories)
  29. Electrical distance‏‎ (4 categories)
  30. Daylight control‏‎ (4 categories)
  31. Useful Life (of a lamp)/es‏‎ (4 categories)
  32. Automatic light vessel‏‎ (4 categories)
  33. Mooring eye‏‎ (4 categories)
  34. Decision Maker‏‎ (4 categories)
  35. Leading Lights (G.B.)‏‎ (4 categories)
  36. Circularly polarized wave‏‎ (4 categories)
  37. Hack boat (GB)‏‎ (4 categories)
  38. Balustrade‏‎ (4 categories)
  39. Base line extension‏‎ (4 categories)
  40. Nominal operating cell temperature‏‎ (4 categories)
  41. Dielectric reflector‏‎ (4 categories)
  42. Commutated-capacitor tachometer‏‎ (4 categories)
  43. Pulse‏‎ (4 categories)
  44. Beat reception‏‎ (4 categories)
  45. Filament/es‏‎ (4 categories)
  46. Confidence interval‏‎ (4 categories)
  47. Quality Management System (QMS)‏‎ (4 categories)
  48. Blip‏‎ (4 categories)
  49. Outfall Mark (or Buoy)‏‎ (4 categories)
  50. Conversion‏‎ (4 categories)
  51. Bringing into service‏‎ (4 categories)
  52. Analogue-digital convertor‏‎ (4 categories)
  53. Mantle‏‎ (4 categories)
  54. Craft autonomous integrity monitoring (CAIM)‏‎ (4 categories)
  55. Burn-in‏‎ (4 categories)
  56. Antenna matching unit‏‎ (4 categories)
  57. Echoing volume‏‎ (4 categories)
  58. Receiver radiation‏‎ (4 categories)
  59. Carrier (wave)‏‎ (4 categories)
  60. Atmospheric Transmission Factor‏‎ (4 categories)
  61. Electroluminescence/es‏‎ (4 categories)
  62. Ship Domain‏‎ (4 categories)
  63. Decay time (of a pulse)‏‎ (4 categories)
  64. Lantern gallery‏‎ (4 categories)
  65. VTS Personnel‏‎ (4 categories)
  66. Characteristic frequency‏‎ (4 categories)
  67. Ground chain‏‎ (4 categories)
  68. Pole Beacon‏‎ (4 categories)
  69. Vessel Traffic Service (VTS)‏‎ (4 categories)
  70. Harmful interference‏‎ (4 categories)
  71. T antenna‏‎ (4 categories)
  72. Occultation‏‎ (4 categories)
  73. Bellini-Tosi antenna‏‎ (4 categories)
  74. Fixed-pitch blade‏‎ (4 categories)
  75. Adaptation‏‎ (4 categories)
  76. Directional pattern‏‎ (4 categories)
  77. Loran Envelope match‏‎ (4 categories)
  78. Boost charge‏‎ (4 categories)
  79. Focal Plane (of a lens or focusing reflector)‏‎ (4 categories)
  80. Overload (2)‏‎ (4 categories)
  81. Allard's Law‏‎ (4 categories)
  82. Diverted Beam‏‎ (4 categories)
  83. Integrated navigation system‏‎ (4 categories)
  84. Anechoic room‏‎ (4 categories)
  85. Isolated danger‏‎ (4 categories)
  86. Photometry‏‎ (4 categories)
  87. Effective range‏‎ (4 categories)
  88. Cathodic protection (2)‏‎ (4 categories)
  89. Elliptically polarized wave‏‎ (4 categories)
  90. Lateral system of marking‏‎ (4 categories)
  91. VTS traffic image‏‎ (4 categories)
  92. Position line (2)‏‎ (4 categories)
  93. Single-Occulting Light‏‎ (4 categories)
  94. Designation of emissions‏‎ (4 categories)
  95. Light vessel‏‎ (4 categories)
  96. Warning‏‎ (4 categories)
  97. Coincidence factor‏‎ (4 categories)
  98. Bearing - Relative‏‎ (4 categories)
  99. Absorptance/de‏‎ (4 categories)
  100. Lobe‏‎ (4 categories)
  101. Binary coded decimal (notation)‏‎ (4 categories)
  102. Dispersion‏‎ (4 categories)
  103. World-Wide Radio Navigation System‏‎ (4 categories)
  104. Contrast Threshold‏‎ (4 categories)
  105. Alternating Sectors‏‎ (4 categories)
  106. Buoy light‏‎ (4 categories)
  107. Periodic duty‏‎ (4 categories)
  108. Angular deviation loss‏‎ (4 categories)
  109. Mean power (2)‏‎ (4 categories)
  110. Curve of Luminous Intensity Distribution‏‎ (4 categories)
  111. Gap coding‏‎ (4 categories)
  112. Electrical scanning‏‎ (4 categories)
  113. Daymark‏‎ (4 categories)
  114. Usual range of a sound signal‏‎ (4 categories)
  115. Grapnel‏‎ (4 categories)
  116. Automatic noise limiter‏‎ (4 categories)
  117. End fire array‏‎ (4 categories)
  118. Mooring line‏‎ (4 categories)
  119. Leading Marks (G.B.)‏‎ (4 categories)
  120. Band pressure level‏‎ (4 categories)
  121. Night effect‏‎ (4 categories)
  122. Baseband‏‎ (4 categories)
  123. Nominal range of a sound signal‏‎ (4 categories)
  124. Bed (of a machine)‏‎ (4 categories)
  125. Accuracy‏‎ (4 categories)
  126. Root mean square error (RMS)‏‎ (4 categories)
  127. Confidence level‏‎ (4 categories)
  128. Quantity of Light‏‎ (4 categories)
  129. Blip scan ratio‏‎ (4 categories)
  130. Forelock‏‎ (4 categories)
  131. Analogue data‏‎ (4 categories)
  132. Drift circle‏‎ (4 categories)
  133. Mantle Burner‏‎ (4 categories)
  134. Burner‏‎ (4 categories)
  135. Antenna radiation resistance‏‎ (4 categories)
  136. Eclipse‏‎ (4 categories)
  137. Service buoy‏‎ (4 categories)
  138. Carrier power‏‎ (4 categories)
  139. Lantern glazing (GB)‏‎ (4 categories)
  140. Ground clutter‏‎ (4 categories)
  141. Axis (of a fixed lens)‏‎ (4 categories)
  142. Multi-point mooring‏‎ (4 categories)
  143. Harmonic radiation‏‎ (4 categories)
  144. Fatigue‏‎ (4 categories)
  145. Occulting Hood‏‎ (4 categories)
  146. Diffuse Reflection‏‎ (4 categories)
  147. Link‏‎ (4 categories)
  148. Complementary Wavelength‏‎ (4 categories)
  149. Hue‏‎ (4 categories)
  150. Bellini-Tosi direction finder‏‎ (4 categories)
  151. Fixed Lens‏‎ (4 categories)
  152. Adaptation/de‏‎ (4 categories)
  153. Loran Fixed slave time delay‏‎ (4 categories)
  154. Quiescent Load‏‎ (4 categories)
  155. Booster transformer‏‎ (4 categories)
  156. Focal Plane (of a light)‏‎ (4 categories)
  157. Overload protection‏‎ (4 categories)
  158. Diverting Prism‏‎ (4 categories)
  159. Corner antenna‏‎ (4 categories)
  160. Radio beacon - Continuous carrier‏‎ (4 categories)
  161. Bulb/es‏‎ (4 categories)
  162. Photopic Vision‏‎ (4 categories)
  163. Efficiency of a sound source‏‎ (4 categories)
  164. Dan buoy‏‎ (4 categories)
  165. Catoptric‏‎ (4 categories)
  166. Modulus of elasticity‏‎ (4 categories)
  167. VTS workstation‏‎ (4 categories)
  168. Position of rest‏‎ (4 categories)
  169. Backwash‏‎ (4 categories)
  170. Navigation Mark‏‎ (4 categories)
  171. Detecting element‏‎ (4 categories)
  172. Visual Range‏‎ (4 categories)
  173. Light vessel station‏‎ (4 categories)
  174. Collapse load‏‎ (4 categories)
  175. Bearing calibration‏‎ (4 categories)
  176. Fenders/es‏‎ (4 categories)
  177. Oil Lamp/es‏‎ (4 categories)
  178. Binary counter‏‎ (4 categories)
  179. Low Pressure Mercury (Vapour) Lamp‏‎ (4 categories)
  180. World geodetic system (WGS)‏‎ (4 categories)
  181. Radar reflector‏‎ (4 categories)
  182. Breadboard model‏‎ (4 categories)
  183. Double sideband transmission (DSB)‏‎ (4 categories)
  184. Buoy light/es‏‎ (4 categories)
  185. Angular frequency‏‎ (4 categories)
  186. Cut-in wind speed (of a wind-power genearator)/es‏‎ (4 categories)
  187. Cap(G.B.)‏‎ (4 categories)
  188. Gas-Filled Lamp‏‎ (4 categories)
  189. Daytime Character‏‎ (4 categories)
  190. Reference frequency‏‎ (4 categories)
  191. Chain stopper‏‎ (4 categories)
  192. Point Vision‏‎ (4 categories)
  193. Superstructure (of a buoy)‏‎ (4 categories)
  194. End point voltage (G.B.)‏‎ (4 categories)
  195. Mooring recovery wire‏‎ (4 categories)
  196. Decoder‏‎ (4 categories)
  197. Clapotis‏‎ (4 categories)
  198. Pre-Focus Cap‏‎ (4 categories)
  199. Band sound power level‏‎ (4 categories)
  200. Nigrescence Time (of a lamp)‏‎ (4 categories)
  201. Nominal voltage‏‎ (4 categories)
  202. Compaction‏‎ (4 categories)
  203. Bedplate‏‎ (4 categories)
  204. Filament Support/es‏‎ (4 categories)
  205. On-the-Job Training (AtoN)‏‎ (4 categories)
  206. Direct wave‏‎ (4 categories)
  207. Confidence limits‏‎ (4 categories)
  208. Incandescence‏‎ (4 categories)
  209. Quantization‏‎ (4 categories)
  210. Flicker Photometer‏‎ (4 categories)
  211. Air termination (of a lightning protection system)‏‎ (4 categories)
  212. Luminous Intensity‏‎ (4 categories)
  213. Broadside array‏‎ (4 categories)
  214. Analogue signal‏‎ (4 categories)
  215. Drift circle radius‏‎ (4 categories)
  216. Anti-clutter gain control‏‎ (4 categories)
  217. Mercury Bath‏‎ (4 categories)
  218. Service capacity‏‎ (4 categories)
  219. Carrier power (2)‏‎ (4 categories)
  220. Pitch‏‎ (4 categories)
  221. Mixed Reflection‏‎ (4 categories)
  222. Lantern handhold‏‎ (4 categories)
  223. VTS Supervisor‏‎ (4 categories)
  224. Charge (2)‏‎ (4 categories)
  225. Ground swell‏‎ (4 categories)
  226. Azimuth-stabilised P.P.I.‏‎ (4 categories)
  227. Equi-Angular Lens‏‎ (4 categories)
  228. Derating‏‎ (4 categories)
  229. Tail chain‏‎ (4 categories)
  230. Code wheel‏‎ (4 categories)
  231. Bayonet Cap‏‎ (4 categories)
  232. Fatigue limit‏‎ (4 categories)
  233. Occulting Light‏‎ (4 categories)
  234. Diffuse Transmission‏‎ (4 categories)
  235. Link (of a chain)‏‎ (4 categories)
  236. Belt (of a fixed lens)‏‎ (4 categories)
  237. Fixed Light‏‎ (4 categories)
  238. Focus (of a fixed lens)‏‎ (4 categories)
  239. Overload relay‏‎ (4 categories)
  240. Allied Services‏‎ (4 categories)
  241. Corner reflector‏‎ (4 categories)
  242. Integrity‏‎ (4 categories)
  243. Radio beacon - Dual carrier‏‎ (4 categories)
  244. Angle of Divergence‏‎ (4 categories)
  245. Duplex (2)‏‎ (4 categories)
  246. Calibration marks‏‎ (4 categories)
  247. Physical Photometer‏‎ (4 categories)
  248. Lamp‏‎ (4 categories)
  249. Automatic Identification System (AIS)‏‎ (4 categories)
  250. Emergency Alarm‏‎ (4 categories)
  251. Lattice‏‎ (4 categories)
  252. Vacuum Lamp‏‎ (4 categories)
  253. Chopper‏‎ (4 categories)
  254. Backwash (GB)‏‎ (4 categories)
  255. Detection‏‎ (4 categories)
  256. Collector ring‏‎ (4 categories)
  257. Binary digit‏‎ (4 categories)
  258. Optical Panel‏‎ (4 categories)
  259. Low Pressure Sodium (Vapour) Lamp‏‎ (4 categories)
  260. Radar reflector response pattern‏‎ (4 categories)
  261. Fog signal emitter‏‎ (4 categories)
  262. Internal Procedures‏‎ (4 categories)
  263. Buoy pocket‏‎ (4 categories)
  264. Angular resolution‏‎ (4 categories)
  265. Cut-in wind speed (of a wind-power generator)‏‎ (4 categories)
  266. Ashlar‏‎ (4 categories)
  267. Reference input signal‏‎ (4 categories)
  268. Superstructure (of a buoy)/es‏‎ (4 categories)
  269. Mooring rope‏‎ (4 categories)
  270. Decometer‏‎ (4 categories)
  271. Leading line‏‎ (4 categories)
  272. Clapper‏‎ (4 categories)
  273. Halide Lamp‏‎ (4 categories)
  274. Pre-Focus Lamp‏‎ (4 categories)
  275. Bandwidth characteristic‏‎ (4 categories)
  276. Tail tube (of a buoy)‏‎ (4 categories)
  277. Companding‏‎ (4 categories)
  278. Horizontal beam width‏‎ (4 categories)
  279. Acetylene/es‏‎ (4 categories)
  280. Direction Light‏‎ (4 categories)
  281. Incandescence Time (of a lamp)‏‎ (4 categories)
  282. Quantization distortion‏‎ (4 categories)
  283. Time to alarm‏‎ (4 categories)
  284. Float charge‏‎ (4 categories)
  285. Marginally detectable bias (MDB)‏‎ (4 categories)
  286. Sector (of a sector light)‏‎ (4 categories)
  287. Mercury switch‏‎ (4 categories)
  288. Recognition of an AtoN Light‏‎ (4 categories)
  289. Cast in-situ piling‏‎ (4 categories)
  290. Atterberg limits‏‎ (4 categories)
  291. Mixed Transmission‏‎ (4 categories)
  292. Lantern tower‏‎ (4 categories)
  293. Refractor‏‎ (4 categories)
  294. VTS area‏‎ (4 categories)
  295. Chart comparison unit‏‎ (4 categories)
  296. Ground wave‏‎ (4 categories)
  297. B-display‏‎ (4 categories)
  298. Equi-Angular Profile‏‎ (4 categories)
  299. Derivative action‏‎ (4 categories)
  300. Clutter‏‎ (4 categories)
  301. Prism‏‎ (4 categories)
  302. Temporary Light‏‎ (4 categories)
  303. Bayonet Cap/es‏‎ (4 categories)
  304. Fault‏‎ (4 categories)
  305. Occupied bandwidth‏‎ (4 categories)
  306. A-N Radio range‏‎ (4 categories)
  307. Diffuser‏‎ (4 categories)
  308. Fixed Mark‏‎ (4 categories)
  309. Directly controlled variable‏‎ (4 categories)
  310. Winter Buoy (U.S.A.)‏‎ (4 categories)
  311. Initial Operational Capability (IOC)‏‎ (4 categories)
  312. Focusing‏‎ (4 categories)
  313. Spindle Buoy‏‎ (4 categories)
  314. Docking Signals‏‎ (4 categories)
  315. Radio beacon - Non-Directional‏‎ (4 categories)
  316. Bullivant nipper‏‎ (4 categories)
  317. Angle of Divergence/de‏‎ (4 categories)
  318. Isophase Light‏‎ (4 categories)
  319. Arc‏‎ (4 categories)
  320. Metal Vapour Lamp‏‎ (4 categories)
  321. Lamp Changer‏‎ (4 categories)
  322. Gong‏‎ (4 categories)
  323. Subsidiary Light‏‎ (4 categories)
  324. Automatic Identification System (AIS) (2)‏‎ (4 categories)
  325. Mole‏‎ (4 categories)
  326. Vacuum Lamp/es‏‎ (4 categories)
  327. Chopping‏‎ (4 categories)
  328. Bad-bearing sector‏‎ (4 categories)
  329. Near Miss‏‎ (4 categories)
  330. Detection (2)‏‎ (4 categories)
  331. Colorimetry‏‎ (4 categories)
  332. Bearing circle‏‎ (4 categories)
  333. Omega‏‎ (4 categories)
  334. Dilution of precision (DOP)‏‎ (4 categories)
  335. Optical coupler‏‎ (4 categories)
  336. Wreck‏‎ (4 categories)
  337. Ambient noise‏‎ (4 categories)
  338. Maintenance‏‎ (4 categories)
  339. Buoy station‏‎ (4 categories)
  340. Fresnel Lens‏‎ (4 categories)
  341. Permanent Light‏‎ (4 categories)
  342. Mean time between failures (MTBF)‏‎ (4 categories)
  343. Assembled Lens‏‎ (4 categories)
  344. Landmark‏‎ (4 categories)
  345. Reflectance‏‎ (4 categories)
  346. VTS Centre‏‎ (4 categories)
  347. Channel Light‏‎ (4 categories)
  348. Grid Filament‏‎ (4 categories)
  349. Automatic sequence control‏‎ (4 categories)
  350. Classification of bearings‏‎ (4 categories)
  351. Pre-emphasis‏‎ (4 categories)
  352. Systematic error‏‎ (4 categories)
  353. No-break power system‏‎ (4 categories)
  354. Fail safe‏‎ (4 categories)
  355. Difference in Time Of Arrival (DTOA)‏‎ (4 categories)
  356. Horizontally polarized wave‏‎ (4 categories)
  357. Threshold of Illuminance‏‎ (4 categories)
  358. Acoustic impedance‏‎ (4 categories)
  359. Direction Light (2)‏‎ (4 categories)
  360. Loran A‏‎ (4 categories)
  361. Confusion region‏‎ (4 categories)
  362. Incandescent (Electric) Lamp‏‎ (4 categories)
  363. Quantization error‏‎ (4 categories)
  364. Floating Mark‏‎ (4 categories)
  365. Luminous Range‏‎ (4 categories)
  366. Brush‏‎ (4 categories)
  367. Participating Vessel‏‎ (4 categories)
  368. Marginally detectable error (MDE)‏‎ (4 categories)
  369. Butane/es‏‎ (4 categories)
  370. Full Operational Capability (FOC)‏‎ (4 categories)
  371. Anti-fouling paint/es‏‎ (4 categories)
  372. Effective Intensity‏‎ (4 categories)
  373. Glare‏‎ (4 categories)
  374. Refresher Training‏‎ (4 categories)
  375. Chart datum‏‎ (4 categories)
  376. Ground wave - Radar‏‎ (4 categories)
  377. Back echo‏‎ (4 categories)
  378. Equiphase zone‏‎ (4 categories)
  379. Lifting eye‏‎ (4 categories)
  380. Codes on Alerts and Indicators‏‎ (4 categories)
  381. Feathering‏‎ (4 categories)
  382. Octahedral cluster‏‎ (4 categories)
  383. A-display‏‎ (4 categories)
  384. Diffusion‏‎ (4 categories)
  385. Composite Group-Flashing Light‏‎ (4 categories)
  386. Fixed antenna direction finder‏‎ (4 categories)
  387. Disability Glare‏‎ (4 categories)
  388. Focusing Device‏‎ (4 categories)
  389. Radio beacon characteristic‏‎ (4 categories)
  390. Bullseye‏‎ (4 categories)
  391. Angle of Polarization‏‎ (4 categories)
  392. Fusion Frequency‏‎ (4 categories)
  393. Arc (Discharge)‏‎ (4 categories)
  394. Lamp Changer/es‏‎ (4 categories)
  395. Reduced carrier‏‎ (4 categories)
  396. Celestial horizon‏‎ (4 categories)
  397. Gong Buoy (U.S.A.) (2)‏‎ (4 categories)
  398. Automatic Identification System (AIS) (3)‏‎ (4 categories)
  399. Chord line‏‎ (4 categories)
  400. Necessary bandwidth‏‎ (4 categories)
  401. Detection of an AtoN light‏‎ (4 categories)
  402. Light Valve‏‎ (4 categories)
  403. Lighthouse‏‎ (4 categories)
  404. Restoration‏‎ (4 categories)
  405. Colour (G.B.)‏‎ (4 categories)
  406. Bearing correction‏‎ (4 categories)
  407. Omega Antipodal effects‏‎ (4 categories)
  408. Sound emitter‏‎ (4 categories)
  409. Distance finding station‏‎ (4 categories)
  410. Wreck (2)‏‎ (4 categories)
  411. Ambiguity‏‎ (4 categories)
  412. Maintenance-free battery‏‎ (4 categories)
  413. Buoy store‏‎ (4 categories)
  414. Fresnel Profile‏‎ (4 categories)
  415. Assigned frequency‏‎ (4 categories)
  416. Vertical beam width‏‎ (4 categories)
  417. Systematic errors‏‎ (4 categories)
  418. Failure‏‎ (4 categories)
  419. Rhythmic‏‎ (4 categories)
  420. Horn‏‎ (4 categories)
  421. Threshold of hearing‏‎ (4 categories)
  422. Conical Buoy (G.B.)‏‎ (4 categories)
  423. Quantizer‏‎ (4 categories)
  424. Blocking diode/es‏‎ (4 categories)
  425. Alarm‏‎ (4 categories)
  426. Disturbance‏‎ (4 categories)
  427. Sector Angle‏‎ (4 categories)
  428. Effective acoustic centre‏‎ (4 categories)
  429. Mercury wetted relay‏‎ (4 categories)
  430. Types of service‏‎ (4 categories)
  431. Catadioptric‏‎ (4 categories)
  432. Electromagnetic waves‏‎ (4 categories)
  433. Large navigation(al) buoy‏‎ (4 categories)
  434. Refurbishment‏‎ (4 categories)
  435. Chart error‏‎ (4 categories)
  436. Ground wave suppression‏‎ (4 categories)
  437. Port Hand Mark (or Buoy)‏‎ (4 categories)
  438. Back lobe‏‎ (4 categories)
  439. Equipotential bonding‏‎ (4 categories)
  440. Reserve buoyancy‏‎ (4 categories)
  441. Hazard‏‎ (4 categories)
  442. Coefficient of (Reflex) Luminous Intensity‏‎ (4 categories)
  443. Beacon‏‎ (4 categories)
  444. Diffusion Factor‏‎ (4 categories)
  445. Composite Group-Occulting Light‏‎ (4 categories)
  446. Bezold-Briicke Phenomenon‏‎ (4 categories)
  447. Loran chart‏‎ (4 categories)
  448. Winter buoy‏‎ (4 categories)
  449. Racon‏‎ (4 categories)
  450. Along-track error‏‎ (4 categories)
  451. Correcting range‏‎ (4 categories)
  452. Radio beacon range‏‎ (4 categories)
  453. Percentage of Visibility‏‎ (4 categories)
  454. Angle of Uncertainty‏‎ (4 categories)
  455. Cupola‏‎ (4 categories)
  456. Isotropic or absolute gain of an antenna‏‎ (4 categories)
  457. Can Buoy‏‎ (4 categories)
  458. Arc Lamp‏‎ (4 categories)
  459. Metallised Lamp‏‎ (4 categories)
  460. Lampholder‏‎ (4 categories)
  461. Redundancy‏‎ (4 categories)
  462. Unlighted Buoy‏‎ (4 categories)
  463. Gong buoy‏‎ (4 categories)
  464. Chromaticity‏‎ (4 categories)
  465. Ballast‏‎ (4 categories)
  466. Excess attenuation‏‎ (4 categories)
  467. Negative feedback‏‎ (4 categories)
  468. Sinker‏‎ (4 categories)
  469. Lighthouse (PHL)‏‎ (4 categories)
  470. Watchkeeping‏‎ (4 categories)
  471. Colour Filter‏‎ (4 categories)
  472. Omega Commutation‏‎ (4 categories)
  473. Long-Arc Lamp‏‎ (4 categories)
  474. Identification signal‏‎ (4 categories)
  475. Purkinje Phenomenon‏‎ (4 categories)
  476. Order (of an optic)‏‎ (4 categories)
  477. Wreck (2)/es‏‎ (4 categories)
  478. Folded dipole‏‎ (4 categories)
  479. Course‏‎ (4 categories)
  480. International Terrestrial Reference Frame (ITRF)‏‎ (4 categories)
  481. Buoy vent‏‎ (4 categories)
  482. Fresnel region‏‎ (4 categories)
  483. Cut-out wind speed (of a wind-power generator)‏‎ (4 categories)
  484. Carbon Arc Lamp‏‎ (4 categories)
  485. Gaseous Discharge Lamp‏‎ (4 categories)
  486. Assigned frequency band‏‎ (4 categories)
  487. Electrodynamic emitter - Diaphragm assembly‏‎ (4 categories)
  488. Dead time‏‎ (4 categories)
  489. Reflector‏‎ (4 categories)
  490. VTS Manager‏‎ (4 categories)
  491. Character‏‎ (4 categories)
  492. Groin‏‎ (4 categories)
  493. Leg (of chain)‏‎ (4 categories)
  494. Extra High Pressure Mercury (Vapour) Lamp‏‎ (4 categories)
  495. Preventive maintenance‏‎ (4 categories)
  496. Failure rate‏‎ (4 categories)
  497. ODAS buoy‏‎ (4 categories)
  498. Differential relay‏‎ (4 categories)
  499. Rhythmic Light‏‎ (4 categories)
  500. Threshold of perception‏‎ (4 categories)

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