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Isolated Danger Buoys are used to mark:

  1. The preferred side of a channel

  2. An isolated hazard in navigable water

  3. Safe swimming areas

  4. The entrance to a marina

The correct answer is: An isolated hazard in navigable water

Isolated Danger Buoys are used to mark an isolated hazard in navigable water. They are placed in areas where there is a hazard that is not present in the immediate vicinity of the buoy, and serves as a warning to mariners to exercise caution when navigating in that area. Option A is incorrect because preferred side of a channel is usually marked by a lateral buoy. Option C is incorrect because safe swimming areas are usually marked by special purpose buoys. Option D is incorrect because the entrance to a marina is usually marked by a safe water buoy. Therefore, option B is the correct answer as it describes the purpose of an isolated danger buoy.