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Free · 20 questions

Practice IALA Region B inside the wider U.S. aids system

Direct answer

This free 20-question quiz practices IALA Region B lateral aids within the wider U.S. Aids to Navigation System. It also covers preferred channels, cardinal and other shared mark families, regulatory marks, and Intracoastal Waterway overlays. The exercises teach recognition and checking habits; they are not a chart, notice, local direction, or navigation authority.

Questions
20 original questions
System
IALA Region B within USATONS
Feedback
Explanation after each answer
Use
Teaching only, never navigation
Question 1 of 20USATONS · IALA B

Identify this Region B lateral aid.

Understand the result

Use this quiz as a revision plan

Review the explanation for every response, including answers you guessed correctly. The sections below show what the sample covers, what its score can and cannot mean, and where to continue.

What the quiz covers

  • Conventional direction of buoyage before applying lateral colours
  • Port, starboard, and preferred-channel aids in Region B
  • Cardinal, isolated-danger, safe-water, and special marks
  • U.S. regulatory marks and their orange shapes
  • Intracoastal Waterway yellow-square and yellow-triangle overlays
  • Off-station, damaged, missing, or contradictory aid checks

Worked examples

Five representative questions with explanations

These examples are separate from the scored question sequence, so the live quiz can keep its own feedback timing.

Example 1

What must be established before using red-right-returning?

The conventional direction of buoyage.

Colour alone is incomplete until the direction in which the lateral system is being read is known.

Example 2

Does a red-and-green horizontally banded aid mean the same thing as an ordinary lateral aid?

No; it marks a preferred channel at a junction.

The topmost colour indicates the preferred-channel side under the applicable Region B convention.

Example 3

What do orange diamonds, circles, and rectangles add to a U.S. aid?

Regulatory or informational meaning.

The orange shape and associated wording must be read; the buoy is not interpreted as an IALA lateral mark.

Example 4

What does an ICW yellow triangle or square do?

It overlays an Intracoastal Waterway channel-side meaning.

The yellow symbol can modify how an aid is followed on the ICW and must be read with the charted route.

Example 5

May a floating aid be used as an exact surveyed position?

No.

Floating aids can move or be off station, so position and safe water need independent chart and navigation evidence.

How to interpret the score

17–20
Strong recognition sample; review any direction or overlay miss.
13–16
Useful base; revisit the mark families that were confused.
0–12
Rebuild direction-first recognition before adding memory shortcuts.

Continue by topic

Study U.S. basic keelboat knowledgePlace aids inside navigation rules, safety, weather, and sailing decisions.Open resource Practice IALA Region AUse the separate global Region A diagnostic when switching systems.Open resource Browse Compass USAChoose the U.S. course level that matches your training.Open resource

Frequently asked questions

Is IALA Region B the whole U.S. aids system?

No. Region B governs important lateral conventions, while USATONS also includes regulatory aids, ICW overlays, western-river conventions, and other national context.

Can I use these diagrams to navigate?

No. They are simplified teaching diagrams. Use current official charts, publications, notices, and observed aids for navigation.

Why does direction matter before colour?

Because the channel-side meaning of a lateral aid depends on the conventional direction of buoyage. A colour slogan without direction can produce the wrong decision.

Editorial record

Primary sources

Reviewed September 2, 2026. Compass uses these sources to check terminology, scope, and safety boundaries; the questions and diagrams remain independently authored.