Tripping line

When you are berthing stern to – known as mediterranian mooring, and you have doubts concerning unknown obstructions on the seabed, or if you have to anchor in a crowded anchorage, it is better to attach a tripping line to your anchor.
The tripping line is a light buoyed line with one end attached to the crown or to the eye on the back of the anchor, and the other end made fast to a wooden buoy.
Make sure that the buoy is clearly marked, and indicate that it is attached to a tripping line, for example by painting a large anchor on the side of the buoy, so other boats will not moor up to it.
To free the anchor from any obstruction use the tripping line until the anchor is clear.