1. Maritime Communication (AIS Application-Specific Messages)
: In the context of inland AIS technical specifications, FI 22 can also represent the Requested Time of Arrival (RTA) at locks, bridges, or terminals. 2. Medical & Clinical Research
In maritime navigation, refers to a specific "Function Identifier" within the Automatic Identification System (AIS).
: These messages typically warn ships about navigational hazards, restricted zones, temporary obstructions, or meteorological data.
: Many gastrointestinal and epidemiological studies focus on FI.
: Articles often explore the incidence of FI in specific populations (e.g., individuals aged 65 and older) or evaluate new scoring systems for more accurate clinical assessment. 3. Engineering & Industrial Automation
While less common, "FI-22" has historical significance in US federal tax regulations.