[DG] [DG11] calbration speedometer

[Derek - Raymarine - Moderator]

Hi Perseus,

Thank you for your feedback.

There are many other things that can affect performance,

Check the paddlewheel with a small steel screwdriver, you should feel a slight attraction to each lobe or 'tooth' of the paddlewheel, there is a small magnet in each 'tooth' which triggers the speed pulses, occasionally thes emagnets weaken and so cause the transducer to underread.

If the paddlewheel is more than 2 seasons old, replace the paddlewheel and the shaft using a speed transducer service kit.

Check the orientation of the paddlwheel, the flat face of the 'tooth' should be facing towards the bow of the boat.

Are there any obstructions or fouling on the hull of the boat which is impacting the water flow over the transducer?

Where is the transducer located, next to the keel, on the centreline, near the outboard chine of the boat?

regards
Derek