The light rhythm of Morse

🔍 Key Concepts

• Review the IALA Maritime Buoyage System and the purpose of safe water marks, lateral marks, preferred channel marks, and special marks • Recall which type of buoy is used to indicate mid-channel or fairway conditions and is safe to pass on all sides • Connect the meaning of a white light occulting Morse "A" (short-long) with the type of buoy that would use it

💭 Think About

• Ask yourself: Which buoy type is intended to show that there is navigable water all around it, not just on one side? • Think about where you would most need a clear, easily recognizable Morse "A" signal: at a mid-channel/fairway location, at a junction where one channel is preferred, or at a special-purpose area? • Eliminate options that are mainly for marking the edge of a channel (port/starboard sides) or special-use areas rather than indicating general safe water.

✅ Before You Answer

• Match Morse "A" (· —) with the correct buoy type in the IALA buoyage descriptions • Verify the color pattern and topmark normally associated with the buoy that shows Morse "A"—does it fit a safe water/fairway function or a lateral/special function? • Confirm which buoy category specifically states it may exhibit a Morse "A" white light in official buoyage references before choosing.

The light rhythm of Morse

is shown on which buoy(s) (A) Preferred channel buoys

Safe water buoys

Starboard or port side buoys

Special marks

🔍 Key Concepts

💭 Think About

✅ Before You Answer