OPNAV definitions

Opnav

1) Optical navigation
Found on https://www.crosswordclues.com/clue/opnav

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OPNAV

Optical Navigation (images).
Found on http://www.encyclo.co.uk/visitor-contributions.php

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OPNAV

office of the chief of NAVal OPerations
Found on http://www.translationdirectory.com/glossaries/glossary125.htm

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