ISO 19018-2020 pdf free

04-23-2021 comment

ISO 19018-2020 pdf free.Ships and marine technology —Terms, abbreviations, graphicalsymbols and concepts on navigation.
This document provides terms, abbreviations and graphical symbols for use in maritime navigation onboard ships.Symbols for use in mathematical formulae are also given, as applicable.
Normative references:There are no normative references in this document.
Terms and definitions:For the purposes of this document, the following terms and definitions apply.
navigation:process of finding the position of a craft or vehicle, and of planning, recording and controlling itsmovement from one place to another.
Dilution of precision:Dilution of precision (DOP)is a parameter relatingthe precision of the position provided by a positioningsystem to that of the “observed quantities”directly measured by the system. DOP is a measure of theinfluence of loci on the precision of position fixing. DOP is frequently used with a qualifying term, suchas geometric, horizontal, vertical, etc.,to indicate that DOP is related to all or some unknown quantities.
The point of the celestial sphere vertically overhead.The point of the celestial sphere vertically below the observer.
Points of intersection of the celestial sphere and theextended axis of the Earth, labelled N and s.
The celestial pole above the horizon.The celestial pole below the horizon.Any of the four principal directions, north, east,south and west.
The primary reference direction relative to theEarth, indicated by true north (000°) (see 5.1.1).The direction 090° to the right of north.The direction 180° from north.The direction 270° to the right of northor 090° to the left of north.The point of intersection of the ecliptic and the celestial equator, occupied by the Sun as it changesfrom south to north declination; also called “First point of Aries”.
The point of intersection of the ecliptic and the celestial equator, occupied by the Sun as it changesfrom north to south declination; also called “First
point of Libra”.The circle of the celestial sphere formed by theintersection of the celestial sphere and a planethrough the centre of the Earth and perpendicularto the zenith-nadir line.ISO 19018 pdf download.

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