ultramarin marine translations
ultramarin.online
nl echoloding   meting van de diepte met behulp van een echolood;  
de akustische Tiefenmessung
Echolotung
Echoloten
Schallortung 		Tiefenmessung mit Hilfe eines Echolots;
en acoustical (depth) sounding
echo sounding 		depth sounding with an echo sounder emitting sound wave. Based on the knowledge of the speed of sound in water, the principle consists in indirect evaluation of depth by measuring the time taken by a sound wave traveling over this depth.
fr sondage acoustique de la profondeur
échosondage
sondage par le son
sondage ultra-son