While proceeding downriver (descending) you...

Question 1 of 2707066636ee928f7522a1c519ee6

While proceeding downriver (descending) you sight a red diamond-shaped panel with small, red reflector squares in each corner on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers what does this daymark indicate?

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Question 1 of 27070

🔍 Key Concepts

• Western Rivers aids to navigation and how they differ from coastal IALA-B buoyage • Meaning of red diamond dayboards/panels with red reflectors on the Western Rivers • How crossing vs passing situations are marked for downbound (descending) traffic

💭 Think About

• Ask yourself: when you are going DOWNRIVER, is the system primarily helping you know where to cross the river or which side to favor? • Think about what a diamond shape usually suggests in navigation marks on rivers: does it normally mark a hazard, a crossing route, or a side to pass on? • Compare how the chart or river pilot books show locations where the channel shifts from one bank to the other—what type of daymark is used there?

✅ Before You Answer

• Be sure you are thinking specifically about Western Rivers (not general coastal aids or IALA sea buoyage) • Confirm in the Western Rivers system whether red diamond-shaped daymarks are associated with the route of the channel across the river or with special-purpose/hazard information • Double‑check which term (‘crossing’ vs ‘passing’) is used when the channel moves from one side of the river to the other for downbound traffic