Speed transducers
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From our buying guide
Speed sensors use a paddlewheel, or ultrasonic transducers with no moving parts. Both foul: Airmar says growth can impede or freeze a paddlewheel within weeks, and also reduces an ultrasonic sensor's performance.
Check before you buy:
- It suits your hull, since Airmar does not recommend its UDST800 for hulls designed to pull air under them.
- The housing suits your hull too. Airmar and Raymarine rule out plastic on a wood hull and bronze on a metal one.
- You'll calibrate it once fitted, since Raymarine says the reading depends on where it sits, the hull shape and the water flow.