Raymarine DS400 & DS500 Manuale Utente

Chapter 2: Installation

21

            

Figure 2-10:

Vertical Adjustment and Cable Routing

3. When you are satisfied with the position of the transducer, tighten the two 

bracket screws.

1. Become familiar with your fishfinder’s performance at a speed of 4kts 

(5MPH).

2. Gradually increase the boat speed and observe the gradual decline in per-

formance due to turbulent water flowing over the transducer’s active sur-
face.

3. If the degradation is sudden (not gradual), identify the boat speed at 

which the onset occurred. Return the boat to this speed, then gradually 
increase speed while making moderate turns in both directions.

4. If the performance improves while turning, the transducer’s position 

probably needs adjustment. It is probably in aerated water. Move the 
transducer farther down into the water in increments of 3mm (1/8"). If the 
performance does not improve satisfactorily, move the transducer closer 
to the centerline of the boat. Fill unused screw holes with marine sealant.

50 mm (2")

cable cover

Hull projection
3mm (1/8")

parallel to
waterline

cable clamp

D6766-1