Boating Basics Online - Basic Boating Safety Course
Chapter 6 - Operations
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Restricted Visibility

When operating at night, or other times of restricted visibility, the required navigation lights as explained earlier in the required equipment section are mandatory to be displayed. The lights will let each boater know which is the stand-on or give-way vessel and each boater should react accordingly.

A boat approaching in your danger zone (approaching from your starboard side) will show its red (stop) port light. That boat will see your green (go) starboard light. If you do not see a mast light, you know the boat is not power driven (or not operating under its own power, as in the case of a boat being towed) and has the right of way over power driven boats.

During nighttime operations vision can be tricky at best, so a proper lookout and safe speed need constant attention.

During times of restricted visibility such as smoke or fog, additional sound signals are required. Both inland and international rules require that any boat underway in or near a restricted visibility area sound a warning signal every two minutes.

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