You are berthing a 55-metre motor yacht in a Mediterranean marina. As the lines go ashore, the bosun reports that one of the synthetic spring lines has a noticeable flat spot and some surface fuzz near the eye splice. You are also short-handed. How you handle the next ten minutes — and how you got to this point — determines whether the yacht moors safely or suffers a parted line, an injury, or equipment damage.
Mooring Line Types and Their Roles
- Breast lines hold the vessel off or into the berth; they run roughly at right angles to the centreline.
- Springs control fore-and-aft movement; a fore spring runs aft from forward, an aft spring runs forward from aft.
- Headlines and sternlines secure the bow and stern at angles to the quay.
On a yacht, lines are typically polyester, nylon, or a blend. Nylon has higher elasticity — useful for shock-loading in surge conditions. Polyester has less stretch but better UV and abrasion resistance. High-modulus fibres (HMPE/Dyneema) have very low stretch and are used where precision is needed; they give almost no warning before parting and require specific handling.
Pre-Mooring Inspection
Before any manoeuvre, lines should be inspected for:
- External abrasion, flat spots, or glazing (heat damage from surging)
- Internal damage — a line that has been shock-loaded may show no external sign but has suffered core fibre breakage; check by feeling for softness along its length
- Integrity of eye splices and whippings
- Correct diameter and length for the task
The flat spot and fuzz the bosun reports are signs of abrasion and possible heat damage. That line should be withdrawn from service immediately and replaced before the mooring is completed — not afterwards.
Making Fast and Line Management
- Lines are led through fairleads or over rollers to reduce chafe, then secured to cleats or bitts using a figure-of-eight and locking turn, or to a bollard using a round turn and figure-of-eight.
- When surging (paying out under load), always keep turns on to retain control; never allow a free run.
- Nip points between winch drums, fairleads, and cleats are the source of most deck injuries — keep hands clear.
- Lines should be tensioned progressively; a breast line hardened too quickly can bring the bow or stern in unevenly and create a worse angle for the springs.
Ongoing Care
- Rig chafe guards (leather, rubber sleeving, or purpose-made protectors) wherever a line bears against a sharp edge, dock cleat, or pontoon fitting.
- Coil and stow lines clear of deck traffic; do not leave tails as trip hazards.
- Rinse synthetic lines with fresh water after use in salt water and stow dry; UV degrades fibres over time, so covered stowage is preferable.
- Maintain a log of line age and notable load events; replace lines on a routine cycle or immediately after any shock-load event.
- Winch drums, gypsy heads, and fairleads should be inspected for sharp edges or corrosion that accelerate chafe.