Make sure that:
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All the people onboard have life jackets.
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The wind and wave conditions do not exceed the design category of the boat.
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The dead man's switch is switched to driver.
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There is a fire extinguisher (or several) onboard and their approval/inspection date has not expired.
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The needed ropes and anchor are onboard.
Check that:
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There is no water in the bilge.
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All the bilge pumps are functional.
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The bilge has no signs of cooling liquid leaks.
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All deck hatches are tightly closed.
Check that:
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All the fuses are intact.
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The main switches are switched on.
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The batteries have enough power.
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The motor works properly.
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The motor cooling water flows as expected