Collection: Speedometer

Speedometer: Know your speed accurately

Speed ​​is a fundamental factor in navigation, whether you're racing or cruising long distances. A reliable and accurate speedometer is therefore essential to optimize your performance and ensure your safety. At Skysat, we select robust and high-performance speed sensors from leading manufacturers, proven in the most demanding conditions. Discover our range of speedometers and related technologies here, for seamless integration with your navigation system.

types of speedometers

There are different types of speedometers, each with its own advantages and disadvantages in terms of accuracy, reliability, and installation. The choice will depend on your type of boat, your sailing plans, and your budget. Here are the main technologies available:

• Propeller speedometers: These sensors measure the speed of water rotating on a small propeller. They are generally simple to install and relatively inexpensive. However, they can be sensitive to dirt and algae, which can affect their accuracy. Examples: Airmar ST800, B&G DST810.
• Electromagnetic speedometers: These sensors use the principle of electromagnetic induction to measure water speed. They are more accurate and less sensitive to fouling than propeller-driven speedometers. They require a more complex installation, with a sensor passing through the hull. Examples: B&G Speed ​​Sensor, NKE Electromagnetic Speed ​​Sensor.
• Ultrasonic speedometers: These sensors measure water speed using ultrasonic waves. They offer high accuracy and are not affected by dirt. They can be integrated into multifunction transducers (depth, temperature, speed). Examples: Airmar DST900, Garmin Panoptix PS22.

integration and compatibility

Integrating the speedometer with your navigation system is crucial for reliable data transmission and compatibility with other instruments. It's important to check the communication protocols used by the speedometer (NMEA 2000, SeaTalk NG, NMEA 0183) and ensure they are compatible with your navigation system or chartplotter. Here are some key points to consider:

• NMEA 2000 Compatibility: Most modern speedometers use the NMEA 2000 protocol, which allows for bidirectional communication and easy configuration. Check that your navigation system is NMEA 2000 compatible.
• Connections and cabling: Ensure you have the appropriate cables and connectors to connect the speedometer to your navigation system. Some speedometers may require an adapter to connect to a SeaTalk NG or NMEA 0183 network.
• Calibration: Once the speedometer is installed, it is important to calibrate it correctly to obtain accurate measurements. Most navigation systems offer built-in calibration functions.

choosing the right speedometer

The choice of speedometer depends on several factors, including the type of boat, the intended use, and the budget. For coastal cruising, a propeller-driven speedometer may suffice. For offshore sailing or racing, an electromagnetic or ultrasonic speedometer will offer greater accuracy and reliability. Here are some criteria to consider:

• Accuracy: If accuracy is paramount, opt for an electromagnetic or ultrasonic speedometer.
• Reliability: Electromagnetic and ultrasonic speedometers are generally more reliable than propeller speedometers because they are less sensitive to dirt.
• Ease of installation: Propeller speedometers are generally easier to install than electromagnetic or ultrasonic speedometers.
• Budget: Propeller speedometers are generally cheaper than electromagnetic or ultrasonic speedometers.

💡 Skysat's advice

When installing a propeller speedometer, apply a specific antifouling paint to the propeller to minimize the impact of fouling. Also, remember to regularly check the condition of the propeller and clean it if necessary to ensure accurate speed measurement.