Garmin Fishfinder 160C Owner's Manual

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Garmin Fishfinder 160C Owner's Manual Manual pdf 8 page image

2 Fishfinder 160C Owner’s ManualGETTING STARTED > U NDERSTANDING THE FISHFINDER AND SONARThe bottom of the water is always going to be the strongest signal,and therefore the bottom is the continuous, intense red line runningacross the bottom of the screen. The Fishfinder 160C includes thelatest technology in interpreting bottom signals; it can see throughfish, structures, and thermoclines (see page 3). Even so, largeschools of fish or dense structures close to the bottom can affectwater depth return readings.Along the top of the screen, you might see a grouping of intensecolors. This area is surface clutter, which can be caused by waves orany other sonar interference at the surface of the water. Too muchsurface clutter can obscure your view of fish. You can turn down theGain setting to reduce this surface clutter.Between the bottom and the surface clutter, you may see suspendedtargets. By default, the targets appear as arches.NOTE: Suspended target returns might not always appearas perfect arches, due to the speed, fish orientation, or otherconditions.You can turn on the Fish Symbols setting if you want to seesuspended targets indicated by fish shapes instead of arches.Using Dual BeamA dual beam transducer can transmit a narrow or a wide beam. Thewater area covered by the transmitted sound waves is determined bythe transducer beam width and the water depth. The narrow beamprovides crisp detail of what is under your boat, and is very helpfulif you are fishing in deeper water where the beam covers more area(for example, at a depth of 30 feet, the narrow beam covers the areaof about a 7-foot circle).WideBeamNarrowBeamThe wide beam is more helpful in shallow water, because it givesyou a much wider view of objects in the water, including areasbeyond the sides of your boat. At a depth of 30 feet, the wide beamcovers the area of approximately a 20-foot circle.