Simrad TRANSDUCER - INSTALLATION GENERIC REV H Installation Manual page 23

Ways of mounting the transducer
Observe the horizontal and vertical distances (X and Y) between
the keel and the transducer blister. On a medium sized vessel, the
horizontal distance (X) should be approximately 1 meter. The
vertical distance (Y) must in general be as small as possible. This
is important to prevent the keel from shadowing the transducer
beam in shallow waters.
(CD17010D)
B
A
Y
X
(A) = Keel
(B) = Transducer blister
(X) = Horizontal distance between keel and blister
(Y) = Vertical distance between the blister surface and the keel
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