Understanding Waterways & Navigational Aids Flashcards
7 cards from real Boating Certification Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Understanding Waterways & Navigational Aids flashcards as text
What does 'COLREGS' stand for and what does it govern?
Answer: International Regulations for Preventing Collisions at Sea — rules of the road on water
COLREGS stands for the International Regulations for Preventing Collisions at Sea (1972), which establish the rules of the road for vessels on navigable waters.
A vessel is traveling down a river toward the sea. Relative to the ATON system, this vessel is considered to be:
Answer: Proceeding seaward — keep red buoys to port
Heading downstream (toward the sea) means you are proceeding seaward, so red buoys should be kept to port (left) and green to starboard.
What is a 'daymark' as used in the US Aids to Navigation system?
Answer: An unlighted fixed structure that provides visual guidance during the day
Daymarks are unlighted, fixed structures (boards on pilings) that provide visual channel guidance during daylight hours, often shaped and colored like buoys.
On a nautical chart, a sounding figure written in italics indicates:
Answer: Depth at mean high water
Italic soundings on nautical charts represent depths at mean high water, helping boaters identify areas that may be shallow even at high tide.
What is the purpose of the 'Western Rivers' ATON system used on the Mississippi River and its tributaries?
Answer: It uses mile markers and bank-side conventions instead of 'returning from sea'
The Western Rivers system uses mile markers measured from the river's mouth, and red/green placement is based on descending bank (left/right of the river when heading downstream toward the sea).
You see a buoy that is half red and half green with the green portion on top. What does this indicate?
Answer: A preferred channel buoy — the preferred channel is to starboard
A preferred channel buoy with green on top (green-red-green) means the preferred channel is to starboard — treat it as a green buoy and keep it to port.
Which of the following best describes the 'Uniform State Waterway Marking System' (USWMS)?
Answer: A state-level system used on inland lakes and rivers not covered by federal ATON
The USWMS is used by states on inland waters (lakes, ponds, rivers) not covered by the federal ATON system, using white buoys with orange markings for regulatory and information purposes.