Continue reading the main story. Hundreds of pages of sworn testimony by Mr. Trump over the past decade show something less flattering. Some of his claims, made under oath, and under pressure, are shown to be hyperbolic overstatements, and others to be shadings of the truth or even outright misstatements. And in rare instances, he turns boorish and demeaning.
There are two types of sonarâactive and passive. Sonar, short for Sound Navigation and Ranging, is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves. NOAA scientists primarily use sonar to develop nautical charts, locate underwater hazards to navigation, search for and map objects on the sea floor such as shipwrecks, and map the sea floor itself.
Radar of the type used for detection of aircraft. It rotates steadily sweeping the airspace with a narrow beam. Radar is an object detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.