What Is a Mooring Line?
A ready-made berth setup that holds the bow in place on a concrete block on the seabed — the unseen infrastructure behind Mediterranean stern-to berthing without an anchor.
In a marina, a mooring is the berthing arrangement already waiting on the seabed for each berth: a heavy bow line attached to a concrete block or main chain, brought up to the pontoon with a light guide line at the end. As you berth, you take the guide line by hand and lead the heavy mooring line to the bow cleat; no anchor is dropped.
This is why anchors are not used in the marina: if everyone dropped anchor, the chains would be tangled within minutes. The berthing sequence is set.
Berthing sequence
As you come stern-to the pontoon, first pass the stern lines.
Take up the mooring with the guide line, then lead the heavy line to the bow cleat.
Tension the bow line first (how close the boat will sit to the pontoon), then adjust the stern.
A line wrapping around the propeller is the number one marina manoeuvring accident: never engage the engine while the guide line is still in the water. A slack mooring will let the stern blow onto the pontoon in a strong southerly; set it with windy weather in mind.
For long absences, it is worth asking the marina staff to check the mooring tension — it is the insurance policy against returning to find your stern hard against the pontoon. A fouled, weed-covered mooring line should never be handled bare-handed; gloves and a boat hook are standard kit.