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.
A fact known from direct observation.
To provide missing data points by using a mathematical model to extrapolate values that are outside the range of a measuring device.
A written message; a letter, note or memo.
Letters sent between two parties in which one makes an offer and the other accepts it.
Specially sent; intended or prepared to be sent.