A fact known from direct observation.
A premise from which conclusions are drawn.
A floating reference point, or SLDMB, used to evaluate surface currents in a body of water. Often employed by coastal search and rescue.
A fixed reference point or set of reference points which precisely define a system of measurement or a coordinate system.
To provide missing data points by using a mathematical model to extrapolate values that are outside the range of a measuring device.
The act of recognizing or the condition of being recognized (matching a current observation with a memory of a prior observation of the same entity).
Acceptance as valid or true.
Honour, favourable note, or attention.
A return of the feu to the superior.
Official acceptance of the status of a new government by that of another country.
The propriety consisting for antibodies to bind to some specific antigens and not to others.