Ключевые слова: acoustics, alarm, alert, amplifier, announcement, ansage, audio, boat, bullhorn, concept, conceptual, copyspace, cruise, detail, device, emergency, equipment, horizontal, horn, inform, listen, loud, loudness, loudspeaker, marine, maritime, megaphone, message, metal, nautical, notify, old, power, quietly, safe, safety, sea, security, ship, siren, sound, speaker, urgent, vessel, voyage, warning, white,