Maritime study — side-by-side comparisons

When two concepts look identical until you look closer, a side-by-side beats a long article. These are the comparisons we get the most exam questions about: IALA Region A vs Region B, COLREG head-on vs crossing, NUC vs RAM, and COLREG vs the US Inland Rules.

• IALA Region A and Region B — what A vs B actually changes

  Region A or Region B? See which countries use each, compare lateral-mark colours and learn a memory aid.

  Open comparison

• Rule 14 vs Rule 15 — at a glance

  Compare head-on and crossing encounters between power-driven vessels in sight. Read Rules 14 and 15, their conditions and related manoeuvring rules.

  Open comparison

• NUC vs RAM — definitions, lights, shapes

  Compare vessels not under command and restricted in ability to manoeuvre. Learn their lights, day shapes and COLREG differences with visual examples.

  Open comparison

• COLREG (International) vs US Inland — major differences

  Compare selected COLREG and US Inland differences: passing signals, towing lights and anchor exemptions. Check the applicable rules and demarcation lines.

  Open comparison