The charts show a circle with two black...

Question 1 / 27070

Question 1 of 2707066636eea28f7522a1c51af3d

The charts show a circle with two black quadrants located at mile 846.0 AHP. What does this indicate?

Question 1 of 27070

The charts show a circle with two black quadrants located at mile 846.0 AHP. What does this indicate?

🔍 Key Concepts

• Inland river chart symbols and what different circle-and-quadrant patterns are used for • How river mile markings and special facilities (gauges, docks, terminals, information boards) are shown • Difference between a structure or facility symbol and a measurement/monitoring symbol

💭 Think About

• Look at the shape: a circle with two black quadrants. Ask yourself what type of object would need a symbol that suggests measurement, calibration, or reference rather than a commercial facility • Compare what you might expect a dock or terminal symbol to look like versus something that is used by pilots to know water levels or navigation information • Think about which of the answer choices would most logically need to be tied to a specific river mile location for navigation safety, not just commerce

✅ Before You Answer

• Verify what symbol is used on Inland river charts for a location where water level is observed or recorded • Confirm which facilities (like terminals, chemical docks, bulletin boards) are usually labeled primarily with text and simple dock symbols instead of specialized circle‑and‑quadrant symbols • Make sure you are matching the exact symbol (circle and two black quadrants) from a chart symbol key, not just guessing from the answer names