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)