Etymology
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Words related to navigation

*nau- 
nāu-, Proto-Indo-European root meaning "boat."

It forms all or part of: aeronautics; aquanaut; Argonaut; astronaut; cosmonaut; nacelle; naval; nave (n.1) "main part of a church;" navicular; navigate; navigation; navy; naufragous; nausea; nautical; nautilus; noise.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nauh, accusative navam "ship, boat;" Armenian nav "ship;" Greek naus "ship," nautes "sailor;" Latin navis "ship;" Old Irish nau "ship," Welsh noe "a flat vessel;" Old Norse nor "ship."
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*ag- 

Proto-Indo-European root meaning "to drive, draw out or forth, move."

It forms all or part of: act; action; active; actor; actual; actuary; actuate; agency; agenda; agent; agile; agitation; agony; ambagious; ambassador; ambiguous; anagogical; antagonize; apagoge; assay; Auriga; auto-da-fe; axiom; cache; castigate; coagulate; cogent; cogitation; counteract; demagogue; embassy; epact; essay; exact; exacta; examine; exigency; exiguous; fumigation; glucagon; hypnagogic; interact; intransigent; isagoge; litigate; litigation; mitigate; mystagogue; navigate; objurgate; pedagogue; plutogogue; prodigal; protagonist; purge; react; redact; retroactive; squat; strategy; synagogue; transact; transaction; variegate.

It is the hypothetical source of/evidence for its existence is provided by: Greek agein "to lead, guide, drive, carry off," agon "assembly, contest in the games," agōgos "leader," axios "worth, worthy, weighing as much;" Sanskrit ajati "drives," ajirah "moving, active;" Latin actus "a doing; a driving, impulse, a setting in motion; a part in a play;" agere "to set in motion, drive, drive forward," hence "to do, perform," agilis "nimble, quick;" Old Norse aka "to drive;" Middle Irish ag "battle."

circumnavigate (v.)

"to sail round, pass round by water," 1630s, from Latin circumnavigatus, past participle of circumnavigare "to sail round," from circum "around" (see circum-) + navigare (see navigation). Related: Circumnavigated; circumnavigating; circumnavigable.

navigable (adj.)

mid-15c., "affording passage to ships," from Old French navigable (14c.) or directly from Latin navigabilis, from navigat-, past-participle stem of navigare "to pass over in a ship" (see navigation). Related: Navigability.

navigate (v.)

1580s, "move from place to place in a ship, sail" (intrans.), a back-formation from navigation, or else from Latin navigatus, past-participle of navigare "to sail, sail over, go by sea, steer a ship," from navis "ship" (from PIE root *nau- "boat") + root of agere "to set in motion, drive, drive forward" (from PIE root *ag- "to drive, draw out or forth, move"). Transitive sense of "to pass over in a ship or ships, sail on" is from 1640s; that of "to steer, direct, or manage in sailing" is from 1660s. Extended to balloons (1784) and later to aircraft (1901). Related: Navigated; navigating.

navigational (adj.)

"of or pertaining to navigation," 1862, from navigation + -al.

navigator (n.)

1580s, "one who navigates, one who directs the course of a ship," from Latin navigator "sailor," agent noun from navigat-, stem of navigare "to sail, sail over" (see navigation). Meaning "laborer employed in excavating a canal" is by 1775, from sense in inland navigation "communication by canals and rivers" (1727), later extended to those engaged in making railroads. In England, navigation was used in the sense of "an artificial waterway, or a part of a natural one that has been made navigable" by 1720.