Which error is NOT included in the term "current" when used in relation to a fix?

Correct Answer: Option A — Known compass error

According to Bowditch, the navigational term "current" (or total set and drift) encompasses all unmeasured vector errors affecting the vessel, including ocean currents, tidal currents, leeway, and steering errors. A known compass error is an instrument correction applied directly to the heading, not a component of the environmental current vector.