Simrad EQ60 - Manual (Page 194)

Simrad EQ60
182
857-164342 / Rev.C
In a box keel
Vessels with a box keel may use this for transducer installation.
The box keel is already the deepest part of the vessel. If the box
keel is too narrow to accommodate the transducer, it can be
widened, either symmetrically or to one side only. In the last
case the installation could also be described as a blister merged
into the keel. The figure below illustrates a symmetrical box
keel installation.
Transducer
(C
D30
08)
Box keel
Figure 24 Symmetrical box keel
installation