EntityQ1930418· pop 9· linked from 421 articlesleading lightsSign in to savelight beacons used for watercraft navigation in a shallow or dangerous channel or as position fixingConnectionsUnited States Coast GuardEntityInternational Organization for Marine Aids to NavigationEntitymaritime pilotageEntityUnited StatesCountryGermanyCountryHamburgEntityMassachusettsEntityInternational Standard Book NumberEntitylighthouseEntityElbeEntitynavigationEntityOCLC, Inc.EntityFresnel lensEntityNewburyportEntitymoiré patternEntitylightvesselEntitybeaconEntitygeopositioningEntityfoghornEntityArgand lampEntityCategoriesLighthousesMaritime signallingNavigational aids