Nine situations on the water. Decide which boat keeps clear, then see the rule behind it. Port and starboard, windward and leeward, overtaking, sail and power.
The wind comes from the top in every picture, and the dashed lines show where each boat is heading. Tap the boat that has to keep clear, or use the buttons. The answers follow the international rules at sea (COLREGs); harbours, rivers and inland waters can have their own.
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A · SailingB · Sailing
Who keeps clear?
The rules behind every answer are in Right of way when sailing, and the terms in the glossary: port and starboard, windward and leeward. A quiz doesn't replace training or the full rules.