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, COLREG vs US Inland Rules, and the Spanish PER vs PNB.

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

  Region A or Region B? See which countries use which, the one thing that actually changes, and a memory aid that sticks — with a map and a quick quiz.

  Open comparison

• Rule 14 vs Rule 15 — at a glance

  Rule 14 vs Rule 15 — at a glance

  Open comparison

• NUC vs RAM — definitions, lights, shapes

  NUC vs RAM — definitions, lights, shapes

  Open comparison

• COLREG (International) vs US Inland — major differences

  COLREG (International) vs US Inland — major differences

  Open comparison