Answer: navigable

AnswerCrossword Clue
NAVIGABLELike major channels
NAVIGABLEPassable director Reitman's written up "G.W.T.W." star (9)
NAVIGABLEFit for ships
navigable(of a vessel) Properly equipped, maintained, and operated
navigable(of a track or road) Suitable for transportation; passable
navigablethat can be navigated
navigable(esp. of a website) Easy to get around in; maneuverable
navigable(of a waterway or sea) Able to be sailed on by ships or boats