NAVAID definitions

navaid

(from the article `airport`) The most common form of navaid used for the approach phase of aircraft descent is the instrument landing system (ILS). This is a radio signal that is ...
Found on http://www.britannica.com/eb/a-z/n/19

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navaid

abbreviation: navigation aid (usually radio or electronic)
Found on http://www.encyclo.co.uk/local/20021

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NAVAID

Navigation Aid
Found on http://www.translationdirectory.com/glossaries/glossary287.php

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navaid

an electronic aid to navigation.
Found on https://www.infoplease.com/dictionary/navaid

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