Yacht winterization part 4/4: southern Europe, afloat as standard

In part 2 of this series we covered wintering afloat from the point of view of the on-board systems: batteries, shore power, the generator, air conditioning and water. In part 3, laying up on land, which is the standard in northern Europe because the main threats are frost, ice and snow. In southern Europe (Croatia, Spain and Italy, where we service the electrical systems of many yachts) things look different. Wintering afloat is the norm there, not the exception, and frost and ice hardly ever reach the typical coastal marina. That does not mean you can skip winterizing: the risks are simply different, and you prepare for them differently.

Why afloat is the standard

Several factors lead most owners in the Adriatic, on the Spanish coast or in Sardinia to leave the boat in the marina for the winter instead of hauling out:

• Climate: in a typical Adriatic or Tyrrhenian marina the temperature rarely stays below zero for long, so the risk of water freezing in the systems is much lower than in the north.

• Infrastructure: large marinas have well-organised winter berths and service packages designed for exactly this kind of wintering (more on that below).

• Charter season: many boats go back into service early in spring, and staying afloat shortens the preparation for the first trip.

• Cost: a regular berth is often cheaper than transport to the yard and seasonal storage, especially for larger boats.

That does not mean a boat in southern Europe needs no winterization: only the order of the threats changes.

A different climate, different priorities

In the north the classic “what to prepare for winter” list starts with frost protection. In southern Europe the order is different:

1. Wind, not frost

The main threat to a winter berth in the Mediterranean is strong regional wind, not temperature: the mistral (France, Sardinia), the bora (Adriatic) and the tramontana (Sardinia, Spain) can blow hard for many hours, testing mooring lines, fenders and covers far more than a typical northern winter storm. So before winter it pays to double the mooring lines, protect them from chafe at the fairleads and cleats, add fenders, and remove or secure everything that can work in the wind: sails, bimini, sprayhood.

2. Humidity and UV, not frozen systems

Instead of worrying about a cracked engine block, the owner of a boat wintering in, say, a Croatian marina should focus on two other factors: humidity (which encourages mould when ventilation is poor) and UV radiation, which in a mild climate with frequent winter sun degrades covers, seals and rubber parts much faster than in a cold climate.

3. Galvanic corrosion, not ice

A boat that sits still in sea water for months, permanently plugged into shore power in a busy marina, is more exposed to galvanic corrosion (stray currents between boats on the same supply) than to ice. We covered this in detail in part 2; here is just a reminder: good bonding, a working galvanic isolator and healthy anodes are the basics, not extras.

Dry marinas: a middle way

An increasingly popular alternative, especially in Croatia, is the dry marina: boats are stored ashore in special racks and launched “on demand” within minutes using the marina's lifting equipment. It combines the advantages of both worlds: the underwater hull does not sit in the water all winter (less fouling, easier inspection), and there is no need for classic months-long storage in the yard under a cover. Check whether a marina in your chosen area offers it: it can be a good price compromise between staying afloat and full storage on land. It is mainly an option for smaller motorboats.

Marina service packages: what to order

Large Adriatic marinas offer paid winter care packages for boats that stay afloat, and they are worth using, especially if the owner does not live in the area and cannot come for regular checks in person.

A typical package includes:

• regular starting of the engine and generator: keeps them lubricated and limits the effect of moisture on an idle engine,

• battery checks: charging and condition checks, often priced separately for the starter battery and the house batteries,

• bilge inspection: to catch a possible leak early, before it becomes a serious problem,

• periodic opening and closing of the seacocks: so they do not seize during the long lay-up.

Interesting fact. In some Croatian marinas, battery checks are charged per battery, not per boat: one monthly rate for each battery checked and charged in the marina workshop, and another (slightly higher) rate for checks done on board. It is a good example of why you should read the scope and price list of such a package carefully before signing: the price can vary a lot depending on how many batteries the boat has and where they are charged.

Order the package in advance (some marinas take orders from the start of the season, even without a fixed date) and agree clearly on how often they will visit: “once a month” can mean very different things in different yards.

What you still have to do yourself

Even with a service package, part of the preparation stays with the owner, exactly the jobs described in part 1 of this series:

• preparing the engine and any generator (oil, filter, fuel, fogging),

• washing the hull and deck before “closing up” the boat for the winter,

• securing on-board electronics and valuable equipment: in popular tourist marinas, theft in the off-season is a real risk whatever the climate,

• checking that your insurance covers a winter berth afloat in that country (requirements can differ between countries, and some policies vary cover by region of the Mediterranean).

Series summary

This brings the four-part series on yacht winterization to a close. In short:

• Part 1 laid the common foundation: choosing where the boat will spend the winter and preparing the engine and generator and washing the boat, wherever it ends up.

• Part 2 covered wintering afloat in a Mediterranean marina from the point of view of the systems: batteries, shore power and galvanic corrosion, the generator, air conditioning, the watermaker and water.

• Part 3 walked through the full procedure for laying up on land, from hauling out and supporting the hull to the water systems and the interior.

• Part 4 showed that in southern Europe wintering afloat is not a compromise but a proven standard, one that needs a different order of priorities from northern marinas.

Whatever the region and the option you choose, one principle links all four parts of this series: winterization is not a single job but a process, from the decision in autumn, through regular checks during the winter, to a thorough inspection before the first sail in spring.

The whole series: yacht winterization

• Part 1: water, land or a hangar?

• Part 2: wintering afloat in a marina (Mediterranean)

• Part 3: laying up on land, step by step

• Part 4: southern Europe, afloat as standard

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