Ключевые слова: aid, assistance, beacon, buoy, buoys, clue, concept, conspicuous, contrast, decide, direction, drift, gauge, guide, help, hydrology, infrastructure, logistik, marine, mark, measure, measurement, navigation, navigational, oceanography, pilot, protection, red, reference, research, route, safety, sea, shallow, shipping, ships, signal, strong, support, sure, surface, traffic, water, waterway,