It is part of the official route between Puerto Williams and Strait of Magellan: from islote Anxious - Canal Magdalena - Canal Cockburn - Paso Brecknock or Canal Ocasión - Canal Unión - Paso Occidental - Paso Norte - Canal Ballenero- Canal O'Brien - Paso Timbales - Brazo noroeste del Canal Beagle - Canal Beagle - Puerto Williams (and back).(Chilean ships can use Paso Aguirre)
It was formerly known as Whaleboat Sound, as in US Hydrographic Office, South America Pilot, (1916).