ANEMOMETER
An Anemometer is a marine instrument used to measure wind speed and wind direction relative to a vessel. It provides essential data for safe navigation, maneuvering, weather monitoring, and cargo operations. While not a primary SOLAS-mandated navigation device, anemometers are recognized under IMO guidelines as important bridge meteorological equipment.
Is an anemometer mandatory under SOLAS?
SOLAS does not explicitly mandate an anemometer for all ships; however, it is recommended under IMO guidelines and commonly required by flag states and class for safe navigation.
Why is an anemometer important on ships?
It provides real-time wind information, supporting safe maneuvering, berthing, anchoring, crane operations, and navigation in heavy weather.
What does an anemometer measure?
It measures:
Wind speed (knots or m/s)
Wind direction (relative or true)
What is the difference between relative and true wind?
Relative wind: Wind felt on board due to ship’s movement
True wind: Actual wind direction and speed after compensating for vessel speed and heading
Where is the anemometer sensor installed?
The sensor is usually mounted at the masthead or highest practical point, free from airflow obstruction.
Can anemometer data be integrated with other systems?
Yes. It can be integrated with ECDIS, IBS, DP systems, weather displays, and voyage data recorders (VDR).
How is anemometer accuracy checked?
Accuracy is verified through:
Functional testing
Comparison with meteorological data
Calibration during routine inspections
What happens if the anemometer fails?
The failure should be recorded, and navigation may continue using alternative weather sources until repairs are made.
Does an anemometer require regular maintenance?
Yes. Regular cleaning, inspection, and calibration are required, especially due to salt, dust, and bird fouling.
Is anemometer data required during inspections?
PSC and Class surveyors may check:
Operational status
Display readability
Integration with bridge systems
Alarm functionality (if fitted)
Conclusion
An anemometer is an essential meteorological instrument that supports safe ship handling and navigation. When properly installed, maintained, and integrated in line with IMO best practices, it enhances situational awareness and contributes to safe vessel operations under varying weather conditions.