8 RAYDATA Installation and Operation Handbook2.4 Installing the Depth and Speed TransducersIf you are installing your RayData as a stand-alone unit, you need toinstall the depth transducer and the speed transducer (incorporating thetemperature transducer) that will be connected to the RayData.The depth and speed transducers are normally supplied with detailedinstallation and maintenance instructions. You must read theseinstructions, together with the information in this chapter, beforeattempting to install the transducers.Transducer TypeThe RayData is supplied in various configurations. Depending on yourchoice, one of the following transducer sets is included:• Plastic through hull depth and speed transducers, suitable for use withGlass Reinforced Plastic (GRP), Steel and Aluminium hulls (withsystem M78711).Caution: Plastic through hull transducers must not be used onvessels with wooden hulls.• Bronze through hull depth and speed transducers, suitable for usewith fibreglass and wooden hull installations (with system M78709).• Combined depth and speed bronze triducer (with system M78710).The following transducers are also available as options:• Retractable bronze depth transducer (part number M78717)• Retractable plastic depth transducer (part number M78718)• Plastic transom mount triducer (part number M78917)• Bronze long-stem through hull triducer (part number M78918)• In hull puck (part number M78919)