INLAND ONLY Identify the operation indicated...

🔍 Key Concepts

• Inland Navigation Rules – Rule 27 (Vessels Restricted in Their Ability to Maneuver), including examples such as dredging, underwater operations, and underway replenishment • Meaning of a vertical red–white–red light configuration and what additional side lights (pairs of red or green) usually indicate in dredging or underwater work • Difference between special Navy signals (aircraft carrier flight operations, submarine operations) and the more common inland construction/dredging signals

💭 Think About

• First, look closely at the central group of lights in the illustration: what does a vertical stack of red over white over red usually tell you about the vessel’s status? • Next, examine the pairs of green and red lights to either side of that central group: on dredges or similar vessels, which color marks the safe side to pass, and which marks the obstructed side? • Compare what you see in the picture to what you would expect from an aircraft carrier or submarine – would those normally be operating close to river banks with pairs of fixed lights along the sides?

✅ Before You Answer

• Verify that you recognize red–white–red (vertical) as the standard lights for a vessel restricted in her ability to maneuver (RAM) under Rule 27. • Confirm which color pair (two green vs. two red) indicates the side on which another vessel may pass when a dredge or obstruction is present. • Check whether any of the listed options actually match a RAM dredging/underwater operation pattern; if not, consider whether "None of the above" might be appropriate.

INLAND ONLY Identify the operation indicated by the lights exhibited as shown in illustration D085RR below.

Aircraft carrier engaged in the launching and recovery of aircraft

A vessel aground assisted by tugs

A submarine engaged in underway replenishment

None of the above

🔍 Key Concepts

💭 Think About

✅ Before You Answer