NorthStar Navigation 491 installation manual Installing the transducer, Lwl

Installing the transducer

SECTION TWO — Installing the transducer

pressure waves

1/3 aft
LWL	150-300mm
(Load Waterline Length)
	(6-12")

displacement hull

outboard and I/O

planning hulls inboard

step-hull

fin keel sailboat

full keel sailboat

Best location for the transducer

FIGURE 1: Recommended installation locations for a transducer

A flat-bottom hull provides the best environment for mounting the trans- ducer: It provides a horizontal surface and a constant water flow over the transducer, with little turbulence (see Figure 2 for the recommended transducer incline angle). If the vessel has a deadrise angle greater than 5 degrees, mount the transducer on a fairing block to create a horizontal surface and keep the transducer perpendicular to the waterline (see Figure 3). You must order the fairing block, if needed, from the trans- ducer’s manufacturer.

491 INSTALLATION MANUAL Revision A PAGE 7