nav·i·ga·ble 
(năvĭ-gə-bəl)
(năvĭ-gə-bəl)adj.
1. Sufficiently deep or wide to provide passage for vessels: navigable waters; a navigable river.
2. Capable of being steered. Used of boats, ships, or aircraft.
nav′i·ga·bili·ty, navi·ga·ble·ness n.
navi·ga·bly adv.