Airmar’s revolutionary CS4500 makes cutting-edge speed sensing affordable. Instead of a paddlewheel it uses two transducers mounted in one compact housing to detect particles in the water and calculates speed based on their distance apart. The CS4500 reacts instantaneously to changes in boat speed and is one of the most reliable and accurate speed sensors on the market.

• Unparalleled accuracy as low as 0.1 knots (0.1 MPH)
• Designed for use with all types and sizes of sailboats and powerboats
• No moving parts
• Makes retrofitting a breeze—the retractable insert fits most Airmar 51 mm (2\") housings
• Low-profile plastic or bronze housings available
• Built-in temperature sensor
• Optional Data Converter changes analog signal to NMEA 0183 data stream