950-70017001/Iss 1.2
EQ-55 Operators Manual
Page 3.8
Principles of Operation of an Echo Sounder
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
3.4
CHOICE OF FREQUENCY
Your EQ-55 has two built-in frequencies. The lower frequency is most useful for
work in deep water. The high frequency will not usually be able to see as deep
as the lower frequency, but the higher frequency is best for seeing small targets
and greater detail. For example, looking for small bait fish is best done with the
high frequency. The operations section of this manual will show how to choose
the frequency displays you need. See Figure 3.7
Figure 3.7
- A representation of low frequency versus high frequency.
3.5
EFFECTS OF THE VESSEL'S SPEED
The display of fish on the EQ-55 depends directly on the vessel's speed, as well
as on the depth of the fish. When the vessel is at rest, the echo traces will
appear stretched out and flattened. As the vessel's speed becomes greater, the
echo traces will become shorter and more arched. The reason for this change in
Summary of Contents for EQ 55
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