Which of the following is a common navigational aid used on Lake Ontario?

Navigational aids are crucial for safe boating and navigation on bodies of water like Lake Ontario. Each type of navigational aid serves a specific purpose and enhances safety for mariners.

Buoys are often used to mark channels, indicate hazards, or provide guidance to boaters about safe navigation routes. They can denote navigational channels, provide warning about shallow waters, or notify of specific regulatory information, ensuring that vessels can navigate without running aground.

Signs also play a vital role, providing essential information such as speed limits, no-wake zones, and other critical regulations that boaters must follow. They are typically placed at strategic locations to ensure visibility and clarity for safe boating practices.

Lighthouses serve as landmark navigational aids, especially useful during the night or in poor visibility conditions. They help to guide vessels safely into harbors and away from dangerous areas, often providing a visual point of reference that navigators can use to orient themselves.

Since all three types of aids—buoys, signs, and lighthouses—are commonly used on Lake Ontario to enhance navigation and safety for boaters, the selection of "all of the above" encompasses the full range of these essential navigational aids.