Types of service
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4-2-025
1. Beacon service
A service provided independently of weather conditions, the station transmitting signals at certain fixed times daily or continuously.
Reference: A.L.R.S. (modified)
2. Clear weather transmission
Signals transmitted during clear weather by a station whose service is extended during periods of fog or low visibility.
3. Fog service
The service provided by a radio beacon as an aid to navigation during periods of fog or low visibility.
4. Calibration service
A service provided for the purpose of calibration of direction finders.
Reference: A.L.R.S. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
