B
ASIC
O
PERATION
>
U
NDERSTANDING
S
ONAR
Fishfinder 250/250C Owner’s Manual
33
Understanding the Graph
It is important to understand that the unit does not display a 3-D
representation of the underwater environment. The unit can display
multiple items at the same time and determine when they were
received but not where they originated.
Examples 1 and 2 provide a look at the underwater world from a
top view and illustrate how these views would be displayed on the
graph. On both graphs it appears that the fish and tree are side-by-
side, as shown in Example 1. However, when we look at Example 2,
we see that the fish can be several feet from the tree. It is important
to remember that the Fishfinder cannot determine where in the
coverage area the tree or fish are, only that the returns were received
at the indicated depths in the same time frame.
NOTE:
Remember that the Fishfinder displays a 2-D picture of
the underwater environment. The fish and tree could be located
anywhere in the coverage area at that time.
Branches
Fish
Enlarged
transducer
view
Branches
Fish
Example 2
Example 1
Enlarged
transducer
view
