Speed and direction
An anemometer measures wind speed and a wind vane indicates its direction. Depending on the system, one combined unit may provide both measurements to the instruments.
Apparent and true wind
Apparent wind is the wind experienced by a moving boat. Estimating true wind requires additional consistent speed and heading data; the result depends on their quality and calibration.
Before choosing a sensor
Check mounting, wiring, power, protocol and compatibility with your existing display or gateway. Masthead installation requires safe access and correct calibration.
What a display needs
Apparent wind speed and angle come from the wind sensor. To calculate another value, a display may also need heading and speed; depending on the calculation, the source may be a log or GPS. Check the manual for the inputs used and whether they are current before comparing displays.
Example diagnosis
If speed looks reasonable but the angle stays fixed, first check the selected source and direction updates. If both disappear together, check power and connections. Do not use calibration to conceal a broken sensor: record the original settings and follow the manufacturer’s procedure.
Questions before buying
Request the exact model, interface, power, cable and compatibility with the existing gateway or display. Ask about spares, maintenance, mast access and alignment. A sample illustration is not a specification or confirmation of availability.