Spring Boat Commissioning Checklist: Get Your Yacht Ready

Spring commissioning is the opposite of winterization. You're bringing your boat back to life after months of storage. Skip steps and you'll start the season with overheating engines, dead batteries, leaking fuel lines, or moldy cabins.

A proper commissioning takes 4-8 hours and costs $200-500 in fluids and supplies. It's worth every dollar—it's the difference between a safe, reliable boat and a string of mechanical failures.

Here's the complete checklist to get your yacht ready for the season.

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Pre-launch checklist (before water)

Hull and exterior

• Inspect entire bottom for growth, cracks, and soft spots
• Check for corrosion on metal fittings and thru-hulls
• Inspect gelcoat for blistering (water damage indicator)
• Clean bottom with soft brush (don't sand the antifouling)
• Inspect all deck caulking around ports and hardware
• Check window and portlight sealants
• Verify all bolts and fasteners are tight
• Wipe down with fresh water and mild soap

Engine system

Antifreeze removal (critical):

• Locate cooling system drain plugs
• Drain antifreeze completely into a container
• Refill with proper coolant per your manual
• Start briefly (5 seconds only) to circulate
• Check for leaks

Oil and filter:

• Check oil level (between MIN and MAX)
• Inspect filter for leaks or corrosion
• Look for drips in the bilge

Fuel system:

• Check fuel level and color
• Inspect fuel lines for cracks or corrosion
• Check filter (should be clear)
• Look for water in the system

Electrical system

• Check battery voltage (12.6V+ = fully charged)
• Clean battery terminal corrosion
• Verify secure mounting
• Test starter (smooth, quick cranking)
• Turn on all lights and instruments
• Test VHF radio and GPS

Plumbing system

• Turn on fresh-water pump and run all faucets (until antifreeze smell clears)
• Check for leaks under sinks and in bilge
• Open seacocks slowly
• Check toilet and heads for antifreeze residue
• Verify holding tank is empty

Safety systems

• Check fire extinguisher pressure gauges
• Count and inspect PFDs
• Check flare expiration dates
• Verify first-aid kit supplies
• Test VHF and GPS functionality

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Launch-day checklist

• Verify cabin windows/ports closed
• Confirm boom is secured
• Check mainsail cover removed
• Verify fuel valve open
• Test electrical switches
• Start engine (should crank and start in 5-10 seconds)
• Listen for unusual noises
• Check oil pressure (should rise within 10 seconds)
• Verify cooling water is flowing (check raw-water discharge)
• Check for leaks in engine compartment
• Gradually increase RPM once away from dock
• Monitor engine temperature

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First week after launch

• Check oil level and top up if needed
• Inspect bilge for leaks
• Change oil and filter (engine break-in period)
• Check all hose clamps for leaks
• Inspect through-hulls for seepage
• Test all systems once more
• Verify alternator charging (13.5-14.5V at 1000 RPM)
• Recalibrate compass if needed

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Common commissioning problems

Engine won't start

• Check battery voltage (12V+)
• Verify fuel supply
• Ensure antifreeze completely drained
• Have mechanic check starter if persists

Engine overheating

• Stop immediately
• Check for air in cooling lines
• Verify raw-water intake not clogged
• Try second restart (air bleeds out)
• Have mechanic inspect cooling impeller if persists

Weak battery/slow cranking

• Clean corroded terminals
• Charge battery 4-8 hours
• Replace if won't hold charge

Fuel smell or discoloration

• Replace degraded fuel
• Drain tank and refill with fresh fuel

Bilge water after launch

• Small amounts normal (condensation)
• Run bilge pump
• Check for leaks if water returns
• Inspect hose connections and through-hulls

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Bottom line

Spring commissioning prevents costly breakdowns at sea. Follow the checklist systematically:

1. Before launch: Hull, engine, electrical, plumbing, safety
2. At launch: Engine startup, systems check, underway monitoring
3. First week: Oil change, leak checks, system verification

A methodical commission is the difference between a reliable boat and months of mechanical failures.