Availability

From International Dictionary of Marine Aids to Navigation
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The percentage of time that an aid, or system of aids, is performing a required function under stated conditions. Non-availability can be caused by scheduled and/or unscheduled interruptions.

– Signal availability. The availability of a radio signal in a specified coverage area.

– System availability. The availability of a system to a user, including signal availability and the performance of the user’s receiver.


Source: Nick Ward, Vicechair, IALA e-Nav Committee, March 2009

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International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM