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.
A trace, or slight indication.
Uncertainty, doubt.
The imagining of something without evidence.
The act of suspecting something or someone, especially of something wrong.
The condition of being suspected.
To suspect; to have suspicions.