Site Requirements; Transducers - Raymarine ST40 Owner's Handbook Manual

Chapter 3: Installation

Site requirements

Hull material
GRP
Steel
Aluminium
Wood
Note: If you intend fitting a nonstandard transducer, extra tools may
be required

Transducers

The transducer types required for the various hull types are as follows:
Speed transducer
M78712 Through hull plastic
(supplied as standard)
M78716 Through hull bronze
75 mm (2.94 in)
diameter
Depth
51 mm (2.0 in)
diameter
75 mm (2.94 in)
diameter
Plastic through hull transducer dimensions
57 mm
(2.25 in)
51 mm
(2.0 in)
Depth transducer
M78713 through hull plastic
(supplied as standard) or
M78718 Retractable through hull
M78714 Through hull bronze
Speed
5 mm
(0.19 in)
D4643-1
75 mm (2.94 in)
diameter
51 mm (2.0 in) 14 mm
diameter (0.57 in)
75 mm (2.94 in)
diameter
17
D4447-2