The International Regulations for Preventing Collisions at Sea (COLREG) demand that a proper lookout is kept at all times, and the right of way rule is followed.
The following factors can considerably reduce visibility, among other things:
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Gear trim angle
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Trim tab angle
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Load and load position
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Speed
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Rapid acceleration
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Changeover from displacement speed to planing
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Sea conditions
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Rain and thunderstorms
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Darkness and fog
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Inner lighting when under way in the dark
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Position of curtains
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People and equipment that block the driver's view.
 
Make only small adjustments at a time. Holding down the button for the trim tab for any length of time can result in partial loss of control of the boat.