Garmin 90/140 - Manual (Page 8)

2 Fishfinder 90/140 Owner’s Manual
G
ETTING
S
TARTED
> U
NDERSTANDING
D
UAL
B
EAM
T
RANSDUCER
C
OVERAGE
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).
Wide
Beam
Narrow
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.