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...navigation. The signals were fixed, associated with lights and other fixed aids, or installed aboard ships enabling warning of fixed hazards or signaling b .... Electrical striking systems allowed the bells to be connected to surface aids. Canadian experiments showed the practicality of determining direction by c ...

===Navigational buoys=== ...nically as a replacement for a [[lightvessel]].<ref>{{Cite web|title=Large Navigational Buoys (LNB)|url=http://www.uscg.mil/history/articles/LNB.asp|publisher=Unit ...

...ical devices and aids that can be considered prosthetics include [[hearing aids]], [[visual prosthesis|artificial eyes]], [[palatal obturator]], [[Adjustab === Hearing aids === ...

...a mobile navigation instrument receives radio signals from [[radio beacon|navigational radio beacons]] whose position is known, and by precisely measuring the arr ...ls | year=2005 |url=https://books.google.com/books?id=cU9k_GDAzDAC&q=Radio+Aids+to+Navigation%2C+Publication+117 |publisher=Lighthouse Press | isbn=978-157 ...