Raymarine L470 - Manual (Page 11)

Installation
5
Fig. 2-1
Transducer
Types
Selecting the Correct Type of Transducer
Before you begin the installation, double-check to be sure you have the
correct type of transducer. Each kind of transducer is designed for a
particular type of use. In this manual we will include detailed mounting
instructions for the transom-mount transducer. We will also include some
general information on the other types. For detailed information on these
other transducers, see the instructions which are packaged with the unit.
Use a transom-mount transducer if –
. . . your boat has an outboard or inboard-outboard engine(s), and if you’re
planning to use the Sidelooker option. This type of transducer must be
mounted ahead of or beside the propeller(s). Do not use this type of
transducer for a boat with a straight-shaft inboard engine.
Use a thru-hull transducer if –
. . . your boat has a straight-shaft inboard engine. This type of transducer
is installed in a hole drilled through the hull.
Use an in-hull transducer if –
. . . you have a high-speed boat or if, for some reason, you cannot use a
transom-mount or thru-hull transducer. The hull may be no more than 1" thick.
M78898
Transom-mount
transducer
M78923
Thru-hull
transducer
M99-142
Fairing for
thru-hull transducer
M78946
In-hull
transducer
M78930
Sidelooker
transducer for
transom mount
M78929
Sidelooker
transducer for
trolling motor