What is Navigation?

Legal Definition
Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space navigation.

It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks. All navigational techniques involve locating the navigator's position compared to known locations or patterns.

Navigation, in a broader sense, can refer to any skill or study that involves the determination of position and direction. In this sense, navigation includes orienteering and pedestrian navigation. For information about different navigation strategies that people use, visit human navigation.
-- Wikipedia
Legal Definition
The act of traversing the sea, rivers or lakes, in ships or other vessels; the art of ascertaining the geographical position of a ship, and directing her course.

2. It is not within the plan of this work to copy the acts of congress relating to navigation, or even an abstract of them. The reader is referred to Story's L. U. S. Index, h. t.; Gordon's Dic. art. 2905, et seq.
-- Bouviers Law Dictionary
Legal Definition
The act or the science or the business of traversing the sea or other waters in ships or vessels. Pollock v. Cleveland Ship Building Co., 56 Ohio St. 655, 47 N. E. 582; The Silvia, 171 U. S. 462, 19 Sup. Ch 7, 43 L. Ed. 241; Laurie v. Douglass, 15 Mees. & W. 746.
See also
-- Black's Law Dictionary