The route is difficult to navigate due to frequent narrows and unpredictable winds and currents. Maritime piloting is now compulsory. The strait is shorter and more sheltered than the Drake Passage, the often stormy open sea route around Cape Horn, which is beset by frequent gale-force winds and icebergs. Along with the Beagle Channel, the strait was one of the few sea routes between the Atlantic and Pacific before the construction of the Panama Canal.