Remote controlled vessels like this are operating off the coast of north Dublin. Details are contained in Notice to Mariners number 62 of 2022 (government website).
These craft are small (4.5m x 2.2m), dark, heavy (750kg) and mobile (3.5kt). That makes them particularly hard to spot from a small boat, and the consequences of a collision are potentially severe.
We are writing to the project managers and the Department of Transport to express our members’ concern and to suggest ways to make them more visible.
(Photographs by Brian Lennon)