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	mads.xsd"><authority><topic authority="https://bibliotecadigital.fia.cl/tesauro/vocab/">Ayuda a la navegación</topic></authority><related type="narrower"><topic>Ayuda por radio</topic></related><related type="narrower"><topic>Baliza acústica</topic></related><related type="narrower"><topic>Boya</topic></related><related type="narrower"><topic>Carta náutica</topic></related><related type="narrower"><topic>Compás</topic></related><related type="narrower"><topic>Marca marítima</topic></related><related type="narrower"><topic>Sistema de posicionamiento acústicos submarinos</topic></related><related type="broader"><topic>Equipo</topic></related></mads>