316:
269:
706:
300:
339:
144:
284:
938:
958:
32:
968:
948:
540:
207:
During the day, the lights may not easily be seen and therefore leading lights are often fitted with secondary visual aids, e.g. large red flags with wide black lines running down them. When both red flags and black lines line up, the navigator knows that the vessel is on the correct bearing. The
203:
Two lights are positioned near one another. One, called the front light, is lower than the one behind, which is called the rear light. At night when viewed from a ship, the two lights only become aligned vertically when a vessel is positioned on the correct bearing.
129:
177:
that can be used for safe navigation. The beacons consist of two lights that are separated in distance and elevation, so that when they are aligned, with one above the other, they provide a bearing. Range lights are often illuminated day and night.
906:
315:
420:
268:
916:
878:
245:
Leading lights are sometimes designed to be movable, allowing their position to be shifted in the event of a change in the safe channel; these include one at
596:
219:, have a series of leading lines. When it is necessary to make a turn, the navigator lines up the next pair of leading lights. This provides guidance from
883:
299:
873:
571:
971:
495:
283:
150:, Germany, with the rear light in a proper lighthouse and the front light on a smaller tower. No standardised markings are used here.
520:
443:
115:
367:
49:
96:
53:
68:
306:
132:
1002:
901:
868:
393:
246:
911:
274:
75:
992:
235:
42:
564:
544:
402:
416:
82:
951:
705:
64:
730:
591:
169:
to indicate a safe passage for vessels entering a shallow or dangerous channel; they may also be used for
147:
649:
957:
997:
941:
852:
847:
842:
837:
832:
827:
822:
770:
557:
191:
639:
629:
344:
922:
806:
791:
735:
624:
601:
516:
491:
487:
464:
439:
227:
513:
American lighthouses : a comprehensive guide to exploring our national coastal treasures
395:
Light List, Volume I, Atlantic Coast, St. Croix River, Maine to
Shrewsbury River, New Jersey
373:
362:
254:
89:
644:
634:
170:
143:
370:, similar lights used in aviation to guide pilots to the right approach angle for landing
745:
654:
338:
986:
250:
239:
231:
162:
20:
760:
755:
691:
357:
128:
961:
740:
725:
659:
322:
31:
796:
765:
720:
580:
334:
166:
468:
801:
539:
686:
174:
136:
750:
676:
438:(2004 ed.). Bethesda, Md.: Paradise Cay Publications. p. 64.
417:"Dictionary of the International Association of Lighthouse Authorities"
352:
226:
Leading lights were used in Great
Britain as early as 1763 to mark the
220:
216:
182:
775:
461:
The port of
Hamburg, with plans, charts and numerous illustrations
142:
127:
436:
The
American practical navigator : an epitome of navigation
290:
212:
553:
549:
25:
511:
Roberts, Bruce; Shelton-Roberts, Cheryl; Jones, Ray (2012).
208:
structures are usually painted to make them more prominent.
257:, predecessor to the Nantucket Harbor Range shown above.
223:
to the sea, using successive pairs of leading lights.
515:(3rd ed.). Guilford, Conn.: Globe Pequot Press.
463:. Hamburg: Meissner & Christiansen. p. 204.
195:
in the UK. The beacons may be artificial or natural.
907:
892:
861:
815:
784:
713:
669:
617:
610:
421:
56:. Unsourced material may be challenged and removed.
185:are unlighted, in which case they are known as a
917:International Lighthouse and Lightship Weekend
234:were privately established by subscription at
565:
8:
614:
572:
558:
550:
116:Learn how and when to remove this message
482:Robinson, John; Robinson, Diane (2007).
385:
264:
230:. The first set of range lights in the
148:A pair of leading lights in Bremerhaven
321:Marking the approach to the island of
289:The twelve standard dayboards used on
165:, are a pair of light beacons used in
173:. At night, the lights are a form of
7:
947:
879:Lighthouses by century of completion
54:adding citations to reliable sources
967:
14:
884:Lighthouses by year of completion
966:
956:
946:
937:
936:
912:Amateur Radio Lighthouse Society
874:Lighthouses by heritage register
704:
538:
337:
314:
298:
282:
267:
30:
368:Visual approach slope indicator
211:Some major rivers, such as the
41:needs additional citations for
1:
307:Margaree Harbour, Nova Scotia
133:Nantucket Harbor Range Lights
902:General lighthouse authority
484:Lighthouses of Liverpool Bay
434:Bowditch, Nathaniel (2002).
597:Conservation of lighthouses
275:Doubling Point Range Lights
247:Hilton Head, South Carolina
1019:
459:Wendemuth, Ludwig (1927).
189:in the United States or a
18:
932:
702:
587:
403:United States Coast Guard
139:are type KRW, see below.
19:For the racehorse, see
731:Automatic lamp changer
592:History of lighthouses
181:In some cases the two
151:
140:
547:at Wikimedia Commons
146:
131:
771:Light characteristic
670:Navigational purpose
405:. 2009. p. 135.
277:on NOAA chart 13296.
50:improve this article
1003:Maritime signalling
869:Lighthouse builders
345:Engineering portal
236:Newburyport Harbor
152:
141:
993:Navigational aids
980:
979:
923:Lighthouse Digest
736:Bird-cage lantern
700:
699:
543:Media related to
488:The History Press
228:Port of Liverpool
126:
125:
118:
100:
16:Navigational tool
1010:
970:
969:
960:
950:
949:
940:
939:
708:
615:
574:
567:
560:
551:
542:
527:
526:
508:
502:
501:
479:
473:
472:
456:
450:
449:
431:
425:
424:
413:
407:
406:
400:
390:
363:PEL sector light
347:
342:
341:
318:
305:Range lights at
302:
286:
271:
255:Nantucket Beacon
157:, also known as
121:
114:
110:
107:
101:
99:
65:"Leading lights"
58:
34:
26:
1018:
1017:
1013:
1012:
1011:
1009:
1008:
1007:
983:
982:
981:
976:
928:
894:
888:
857:
811:
780:
709:
696:
665:
606:
583:
578:
536:
531:
530:
523:
510:
509:
505:
498:
481:
480:
476:
458:
457:
453:
446:
433:
432:
428:
415:
414:
410:
398:
392:
391:
387:
382:
343:
336:
333:
326:
319:
310:
303:
294:
287:
278:
272:
263:
249:, the original
201:
171:position fixing
122:
111:
105:
102:
59:
57:
47:
35:
24:
17:
12:
11:
5:
1016:
1014:
1006:
1005:
1000:
995:
985:
984:
978:
977:
975:
974:
964:
954:
944:
933:
930:
929:
927:
926:
919:
914:
909:
904:
898:
896:
890:
889:
887:
886:
881:
876:
871:
865:
863:
859:
858:
856:
855:
850:
845:
840:
835:
830:
825:
819:
817:
813:
812:
810:
809:
804:
799:
794:
788:
786:
782:
781:
779:
778:
773:
768:
763:
758:
753:
748:
743:
738:
733:
728:
723:
717:
715:
711:
710:
703:
701:
698:
697:
695:
694:
689:
684:
682:Leading lights
679:
673:
671:
667:
666:
664:
663:
657:
655:Skeletal tower
652:
647:
642:
637:
632:
627:
621:
619:
612:
608:
607:
605:
604:
599:
594:
588:
585:
584:
579:
577:
576:
569:
562:
554:
545:Leading lights
535:
534:External links
532:
529:
528:
521:
503:
497:978-0752442099
496:
474:
451:
444:
426:
408:
401:. Light List.
384:
383:
381:
378:
377:
376:
371:
365:
360:
355:
349:
348:
332:
329:
328:
327:
320:
313:
311:
304:
297:
295:
288:
281:
279:
273:
266:
262:
259:
200:
197:
155:Leading lights
124:
123:
38:
36:
29:
15:
13:
10:
9:
6:
4:
3:
2:
1015:
1004:
1001:
999:
996:
994:
991:
990:
988:
973:
965:
963:
959:
955:
953:
945:
943:
935:
934:
931:
925:
924:
920:
918:
915:
913:
910:
908:
905:
903:
900:
899:
897:
895:organizations
891:
885:
882:
880:
877:
875:
872:
870:
867:
866:
864:
860:
854:
853:South America
851:
849:
846:
844:
843:North America
841:
839:
836:
834:
831:
829:
826:
824:
821:
820:
818:
814:
808:
805:
803:
800:
798:
795:
793:
790:
789:
787:
783:
777:
774:
772:
769:
767:
764:
762:
759:
757:
754:
752:
749:
747:
744:
742:
739:
737:
734:
732:
729:
727:
724:
722:
719:
718:
716:
712:
707:
693:
690:
688:
685:
683:
680:
678:
675:
674:
672:
668:
661:
658:
656:
653:
651:
648:
646:
643:
641:
638:
636:
633:
631:
628:
626:
623:
622:
620:
616:
613:
609:
603:
600:
598:
595:
593:
590:
589:
586:
582:
575:
570:
568:
563:
561:
556:
555:
552:
548:
546:
541:
533:
524:
522:9780762779604
518:
514:
507:
504:
499:
493:
489:
485:
478:
475:
470:
466:
462:
455:
452:
447:
445:9780939837540
441:
437:
430:
427:
422:
418:
412:
409:
404:
397:
396:
389:
386:
379:
375:
372:
369:
366:
364:
361:
359:
356:
354:
351:
350:
346:
340:
335:
330:
324:
317:
312:
308:
301:
296:
292:
285:
280:
276:
270:
265:
260:
258:
256:
252:
251:Chatham Light
248:
243:
241:
240:Massachusetts
237:
233:
232:United States
229:
224:
222:
218:
214:
209:
205:
198:
196:
194:
193:
188:
184:
179:
176:
172:
168:
164:
163:United States
160:
156:
149:
145:
138:
134:
130:
120:
117:
109:
98:
95:
91:
88:
84:
81:
77:
74:
70:
67: –
66:
62:
61:Find sources:
55:
51:
45:
44:
39:This article
37:
33:
28:
27:
22:
21:Leading Light
921:
802:Pharologists
761:Lens lantern
756:Fresnel lens
692:Sector light
681:
618:Construction
537:
512:
506:
483:
477:
460:
454:
435:
429:
411:
394:
388:
374:Inogon light
358:Sector light
244:
225:
210:
206:
202:
190:
186:
180:
175:leading line
159:range lights
158:
154:
153:
112:
103:
93:
86:
79:
72:
60:
48:Please help
43:verification
40:
998:Lighthouses
972:WikiProject
785:Maintenance
746:Dalén light
741:Carcel lamp
726:Argand lamp
581:Lighthouses
987:Categories
962:Wiktionary
862:Categories
828:Antarctica
797:Light dues
766:Lewis lamp
721:Aerobeacon
650:Screw-pile
380:References
253:, and the
213:Elbe River
167:navigation
76:newspapers
816:Locations
469:586327105
325:, Finland
242:in 1788.
199:Operation
137:dayboards
942:Category
714:Fixtures
687:Sea mark
662:(acting)
640:Integral
331:See also
106:May 2012
952:Commons
848:Oceania
792:Keepers
751:Foghorn
677:Daymark
630:Caisson
602:Museums
353:Daymark
293:ranges.
261:Gallery
221:Hamburg
217:Germany
192:transit
183:beacons
161:in the
90:scholar
893:Global
838:Europe
823:Africa
807:Tender
776:VRB-25
660:Vessel
625:Aerial
519:
494:
467:
442:
92:
85:
78:
71:
63:
611:Types
399:(PDF)
323:Seili
187:range
97:JSTOR
83:books
833:Asia
645:Pile
635:Crib
517:ISBN
492:ISBN
465:OCLC
440:ISBN
291:USCG
135:The
69:news
238:in
215:in
52:by
989::
490:.
486:.
419:.
573:e
566:t
559:v
525:.
500:.
471:.
448:.
423:.
309:.
119:)
113:(
108:)
104:(
94:·
87:·
80:·
73:·
46:.
23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
