navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)

navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)

navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)

navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)

navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)

navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)

navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)

navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)

navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)

using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs