How to properly prepare your boat for the season?

Introduction

Winter is coming to an end, the days are getting longer, and the temperatures are rising... It's time to think about launching your boat! But before you cast off for the new season, your boat needs some attention. Whether it has spent the winter dry or in the water, several steps are essential to ensure safety and peace of mind. Here’s the complete guide to preparing your boat like a pro.

PHASE 1: General Inspection (2-3 hours)

Start with a complete assessment

Get yourself a notebook and a pen. You will do a full tour of your boat and note everything that needs attention, repair, or replacement.

The Hull

To check:

• Presence of blisters or cracks in the gelcoat

• Condition of the antifouling (chipped, missing?)

• Thru-hull fittings and strainers (clogged, corroded?)

• Sacrificial anodes (replace if worn more than 50%)

Action:

• Wash the hull with a high-pressure washer

• Remove barnacles attached to the propeller, shafts, rudders

• Open any blisters to let them dry

• Apply a coat of wax to protect the gelcoat

The Deck

To check:

• Sealant lines of the portholes and deck hatches

• Condition of the stanchions and lifelines

• Winches and blocks (lubrication needed?)

• Cleats and cam cleats

Action:

• Deep clean with a suitable product

• Replace any defective seals

• Grease all moving parts

The Rigging (for sailboats)

To check:

• Mast and boom (cracks, corrosion?)

• Shrouds and stays (loose cables, rust?)

• Masthead fittings and blocks

• Fixings and pins

Action:

• Grease electrical contacts with petroleum jelly

• Replace broken pins and rings

• Check the tension of the standing rigging

PHASE 2: The Engine (minimum half a day)

The heart of your boat deserves particular attention

If you’re not comfortable, this is the time to call a professional. Engine maintenance is crucial to avoid breakdowns at sea.

Essential Checks

Level and quality of fluids

• Engine oil (color, level)

• Coolant

• Gear oil (outboard engine)

Cooling System

• Impeller (turbine): to be replaced every 2-3 years

• Hoses: check the condition, no cracks

• Water pump: proper functioning

Filters

• Fuel filter: to be replaced systematically

• Oil filter: same

• Air filter: clean or replace

Fuel

• Check the level

• Add a stabilizer if the fuel is old

• Drain the sedimenters

Electricity

• Spark plugs: condition, gap

• Cables and connections: corrosion?

• Starter: proper functioning

The First Start

Procedure:

1. Check all levels

2. Visually inspect the engine

3. Prime the cooling system if necessary

4. Start cold, let it warm up

5. Check that water is exiting through the exhaust

6. Listen to the engine: any unusual noises?

Good to know

If your boat is over 5 years old or has over 500 hours of engine use, a complete inspection by a professional is highly recommended for peace of mind.

PHASE 3: Electricity and Electronics (2-3 hours)

The Batteries

Maintenance

• Check the charge (voltmeter)

• Clean the terminals (baking soda on corrosion)

• Tighten the connections

• Test under load

Replacement if necessary A marine battery has a lifespan of 3 to 5 years. If it shows signs of weakness, replace it BEFORE the season.

The Electronics

To check:

• GPS: map updates?

• VHF: emission/reception test

• Depth sounder: proper functioning

• Autopilot: calibration

To clean:

• Displays (suitable product, no alcohol!)

• Connections and plugs

• Antennas

PHASE 4: Safety Equipment (1-2 hours)

MANDATORY and VITAL

Complete Inventory

Life jackets

• One per person + one for children

• Check the condition, no tears

• Test whistles and inflation systems

• Expiration date OK?

Flares and lights

• Check expiration dates

• Replace if necessary (every 4 years)

• Ensure you have the correct regulatory assortment

Survival Raft

• Mandatory revision every year at an approved center

Fire Extinguishers

• Check the pressure

• Check the revision date

• Replace if necessary

Miscellaneous Equipment

• First aid kit: expired medications?

• Flashlight: batteries OK?

• Fog horn: functional?

• Signal mirror

• Boat hook and towing line

PHASE 5: The Rigging and Lines (2 hours)

The Sails (for sailboats)

Inspection

• Lay out each sail on the ground

• Look for tears, even small ones

• Check the seams

• Inspect the grommets and sail heads

• Clean if necessary (freshwater + mild soap)

Action

• Have any tears repaired by a sailmaker

• Lubricate zippers and sliders

• Store neatly after checking

The Lines

To do:

• Rinse all lines with clean water

• Inspect for wear

• Measure lines that are starting to weaken

• Replace those that are too worn

• Coil neatly and hang in a dry place

Pro Tip

Note in a notebook the installation date of each line and its diameter. This way, you'll know when to replace them and what to repurchase.

PHASE 6: The Cabin Interior (half a day)

The Big Clean

Zone by Zone

• Main saloon: complete cleaning, airing

• Cabins: bedding, pillows (in the sun to disinfect)

• Galley: oven, sink, refrigerator

• Bathrooms: entire system, seals

• Storage: inventory, sorting, reorganization

Moisture Control

• Check for the absence of mold

• Place moisture absorbers

• Airing as much as possible

• Treat mold with a suitable product

The Water System

To do:

• Clean fresh water tanks

• Drain and descale the circuits

• Check the pumps

• Test the faucets

• Check for leaks

PHASE 7: The Final Preparations (1 day)

Provisioning

The essentials on board

• Non-perishable food

• Emergency bottled water

• Cleaning products

• Dishes and utensils

• Linens

Consumables

• Fuel (full tank!)

• Spare motor oil

• Replacement filters

• Replacement bulbs

• Fuses

The Documents

Check that you have on board:

• Boat registration card

• Current insurance

• Boat license

• VHF License (if applicable)

• Maintenance log

• Emergency numbers (CROSS, harbor master...)

PHASE 8: The Test Run

Don't head out on a cruise directly!

Organize a short test run near the harbor to:

• Test the engine under real conditions

• Check the steering

• Test all electronic equipment

• Ensure the windlass is functioning properly

• Check for leaks

Departure Checklist □ Engine: starting, power, temperature □ Steering: smooth, responsive □ Windlass: proper functioning □ Electronics: GPS, depth sounder, VHF □ Bilge pump: test □ Navigation lights: all operational □ No visible leaks

The Ideal Schedule

6 to 8 weeks before launching

• General inspection

• Order necessary parts

• Schedule appointments for professional work

4 weeks before

• Engine work

• Professional maintenance

• Hull work if necessary

2 weeks before

• Finishing touches and cleaning

• Provisioning

• Check safety equipment

1 week before

• Final check

• Launch

• Test run

The Mistakes to Avoid

❌ Postponing repairs "I'll do it later" = guaranteed breakdown in mid-season

❌ Neglecting the engine It's your safety assurance, not an option

❌ Forgetting safety equipment A visit from the Maritime Affairs can be costly

❌ Skipping the test run Better to discover a problem near the harbor

❌ Rushing Take the time to do things properly

Conclusion

Preparing your boat for the season means investing time and a bit of money to spare yourself stress and breakdowns during the summer. It's also an opportunity to rediscover your boat, anticipate its needs, and pamper it before heading back into the adventure. With this complete checklist, you have all the cards in hand for a successful sailing season!

🔧 Need a hand preparing your boat? The Sailtoo jobbers are here to help!