This app will help you in learning navigation rules.
Flashcards are an easy way to learn or polish your knowledge of IRPCS, navigation marks and lights.
Besides of demo cards with cardinal marks, three packs of cards available for in-app purchase:
Pack of 48 cards with IALA A buoyage and lights. The interesting feature is that several cards present images of real buoys.
Pack with Rules of Road cards. Some cards present images of real vessels.
Pack with Vessels' lights cards.