Garmin Fishfinder 140 Owner's Manual - Page 8

GETTING STARTED > UNDERSTANDING DUAL BEAM TRANSDUCER COVERAGE wave information, and then sends the information to the Fishfinder. The Fishfinder displays the information on the screen for you to see and interpret. The type of transducer and settings you choose determine how the information is shown on the screen. Understanding Dual Beam Transducer Coverage A dual beam transducer can transmit a narrow or a wide beam. The water area covered by the transmitted sound waves is determined by the beam width of the transducer and the water depth. The narrow beam provides crisp detail of what is under your boat, and is helpful if you are fishing in deeper water where the beam covers more area (for example, at a 30-foot depth, the narrow beam covers the area of about a 7-foot circle). Narrow Beam Wide Beam The wide beam is more helpful in shallow water, because it gives you a much wider view of objects in the water, including areas beyond the sides of your boat. At a 30-foot depth, the wide beam covers the area of approximately a 20-foot circle. 2 Fishfinder 90/140 Owner's Manual