Simrad EQ60 - Manual (Page 195)

Transducer installation
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857-164342 / Rev.C
Retractable transducer
Retractable hull units are commonly used for horizontal looking
sonars. When not in use, the transducer is retracted into a trunk.
The retractable hull unit is more expensive than a blister, but on
vessels having a hull where it is difficult or impossible to install
a blister, it may be worth-while. A retractable hull unit with
transducer is shown below.
Vessels without a keel and with a wide, flat bottom is an
example where a retractable hull unit can be the only acceptable
method for bringing the echo sounder transducer below the
boundary layer.
Transducer
(C
D
199
9)
Keel
Hull
unit
Figure 25 Retractable hull unit with
transducer