The navigator should be careful due to the traffic of trains, made up of pushers and ferries, in the Estreitos region. Each train can have a maximum length of 355.57m and a beam of 68.75m.
Use a whistle before turning, even at night.
Navigation in the Estreitos is extremely dangerous in rain or fog, even using radar.
Existence of siltation on the margin involved between the Breves and Vira-Saia borehole passages.