The UK MAIB shared valuable lessons learned from an incident involving a ferry which ran over the submerged remains of a derelict mooring dolphin. The ferry’s port propeller, shaft, stern seal and rudder were damaged by the contact. MAIB noted that navigating by eye in a narrow channel is common practice, but it can be misleading, even in familiar waters.
The incident
It was a fine summer’s day and passengers on board a ferry were taking in the sights of a city while enjoying a scheduled river...
https://safety4sea.com/navigating-by-eye-can-be-misleading-even-in-familiar-waters/