🔍 Key Concepts

• Western Rivers dayboards and how they differ from standard lateral marks • Purpose of crossing dayboards in river navigation systems • How mariners are guided when a channel shifts from one bank to the other

💭 Think About

• Ask yourself: When a river channel moves from one side of the river to the other, what kind of visual aid would help you line up on the new course? • Consider what type of mark would be used specifically for a crossing situation, as opposed to simply marking the edge or preferred side of a channel. • Think about which option describes a situation where you must follow a line across the river, rather than staying along one side.

✅ Before You Answer

• Verify which aid is used to show the alignment of the channel as it moves across the river, not just along one bank. • Confirm that you are focusing on Western Rivers-specific dayboards, not general IALA buoyage or ocean markers. • Eliminate any choices that describe overtaking zones or ferry operations, since those are typically marked differently.