# ISO 19018:2020 pdf download – Ships and marine technology — Terms, abbreviations, graphical symbols and concepts on navigation

02-14-2022 comment

ISO 19018:2020 pdf download – Ships and marine technology — Terms, abbreviations, graphical symbols and concepts on navigation.
1 Scope This document provides terms, abbreviations and graphical symbols for use in maritime navigation on board ships. Symbols for use in mathematical formulae are also given, as applicable. 2 Normative references There are no normative references in this document. 3? Terms? and? definitions For the purposes of this document, the following terms and definitions apply. Terms, abbreviation and symbols used in navigation are given in Clauses 4 to 16. Abbreviations can prove useful, but they should not be used in mathematical formulae. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https:// www .iso .org/ obp — IEC Electropedia: available at http:// www .electropedia .org/ 3.1 navigation process of finding the position of a craft or vehicle, and of planning, recording and controlling its movement from one place to another
6.2 Track The term “track” is used a) as the path of voyage over the ground (ground track) or through the water (water track), as plotted in the chart, expressed in angular units from true north (000°) clockwise through <360°; one must distinguish rhumb-line track (see 10.2.11) and great-circle track (see 10.2.9), b) as the path of radar-targets on a plan position indicator.
7 Bearings Bearing (BRG) is an angle measured in the horizontal plane from one of the reference directions specified in Clause 5, measured clockwise from 000° through 360°, written as three-digit numbers. In radar navigation, the abbreviation BRG for bearing is preferred.
8 Corrections The numerical value of a correction is the best estimate which can be made of the difference between the true and the measured value of a parameter. The sign is such that a correction which is to be added to an observed reading is taken as positive.
9? Influence? of? wind? and? current 9.1 Wind Wind direction is the direction where the movement of the air comes from. The vector of this movement is in the opposite direction of the wind direction. For instance, in the case of an east wind, the movement of the air is in the direction of 270° (direction of the vector in weather charts).