Raymarine stand-alone master instrument - Manual (Page 17)

14 ST30 Bidata Operation and Installation Handbook
2.4 Installation
The depth and speed transducers are supplied with detailed installation
and maintenance instructions. These instructions, together with following
notes, should be read thoroughly before attempting to install the
transducers.
Speed transducer (through hull)
For accurate speed readings, locate the speed transducer in the shaded
''clear flow' areas as shown.
D587
The transducer should also be:
• ahead of propellers (10% W.L. length minimum)
• at least 150mm (6in) from the keel (with sailing yachts siting should be
forward of the keel)
• near the centreline of the vessel
• clear of other through hull fittings or projections
• have sufficient clearance inside the hull to allow the nut to be fitted
• have 100mm (4in) clearance above the through hull fitting for
withdrawal
Note: The speed transducer can, if required, be shortened. However, new
1/8in spade connectors must be crimped to the shortened cable.