• Boat speed is calculated by measuring the time taken for pulses to travel through the water between the two sensors positioned fore and aft
• Highly accurate
• No paddlewheel to foul or clean
• Better performance

Sonic Speed Sensor Specifications
Control Box Size: 230.5mm x 126.5mm x 56mm
Weight: 1.2kg (2.65lb)
Transducer: 0.3kg (0.66lb) with 5m (16ft)of cable
Electrical: Supply 12V nominal
Current: 90mA

Ultrasonic Speed Sensor Specifications
Includes a built in sea temperature sensor
Weight: 1.3kg (2.8lb)
Electrical: Supply 10 - 15V nominal
Current: 155mA
DC voltage supply: 10-15 Volts
Ultrasonic frequency: 4.5MHz
Pulse repetition frequency: 5.7kHz (fixed)
Speed measurement: 8-13 cm / 3-5 inches from transducer
Thru-hull diameter: 5.1 cm / 2 inches
Operating temperature range: 0-40°C / 32-140°F
Data update rate: 2Hz
Accuracy: +/- 2% +0.1 knot)
Min speed: 0.1 knot
Max speed: 60 knots
Outputs: simulated hall cell paddlewheel at 20 000 pulses
Transducer cable length: 10 m / 33 ft
Power cable length: 3 m / 10ft
Junction box cable length: 6 m / 20 ft