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Seafarers' Training, Certification and Watchkeeping Code, appended to the STCW Convention

Related Terms

STCW

International Convention on Standards of Training, Certification and Watchkeeping for Seafarers, 1978, as amended

HALF-POWER POINTS

Power ratios used to define the angular width of a radar beam. One convention defines beam width as the angular width between points at which the field strength is 71 percent of its maximum value. Expressed in terms of power ratio, this convention defines beam width as the angular width between half-power points. A second convention defines beam width as the angular width between points at which the field strength is 50 percent of its maximum value. Expressed in terms of power ratio, the latter convention defines beam width as the angular width between quarter- power points.

SOLAS

International Convention for the Safety of Life at Sea, 1974, as amended

INTERNATIONAL TONNAGE CERTIFICATE

A certificate issued to a shipowner by a government department in the case of a ship whose gross and net tonnages have been determined in accordance with the International Convention of Tonnage Measurement of Ships. The certificate states the gross and net tonnages together with details of the spaces attributed to each.

CLOUD CLASSIFICATION

1. A scheme of distinguishing and grouping clouds according to their appearance and, where possible, to their process of formation. The one in general use, based on a classification system introduced by Luke Howard in 1803, is that adopted by the World Meteorological Organization and published in the International Cloud Atlas (1956). This classification is based on the determination of (a) genera, the main characteristic forms of clouds; (b) species, the peculiarities in shape and differences in internal structure of clouds; (c) varieties, special characteristics of arrangement and transparency of clouds; (d) supplementary features and accessory clouds, appended and associated minor clouds forms; and (e) mother-clouds, the origin of clouds if formed from other clouds. The ten cloud genera are cirrus, cirrocumulus, cirrostratus, altocumulus, altostratus, nimbostratus, stratocumulus, stratus, cumulus, and cumulonimbus. The fourteen cloud species are fibratus, uncinus, spissatus, castellanus, floccus, stratiformis, nebulous, lenticularis, fractus, humilis, mediocris, congestus, calvus, and capillatus. The nine cloud varieties are intortus, vertebratus, undulatus, radiatus, lacunosis, duplicatus, translucidus, perlucidus, and opacus. The nine supplementary features and accessory clouds are inclus, mamma, virga, praecipitatio, arcus, tuba, pileus, velum, and pannus. Note that although these are Latin words, it is proper convention to use only the singular endings, e.g., more than one cirrus cloud are, collectively, cirrus, not cirri. 2. A scheme of classifying clouds according to their usual altitudes. Three classes are distinguished: high, middle, and low. High clouds include cirrus, cirrocumulus, cirrostratus, occasionally altostratus and the tops of cumulonimbus. The middle clouds are altocumulus, altostratus, nimbostratus, and portions of cumulus and cumulonimbus. The low clouds are stratocumulus, stratus, most cumulus and cumulonimbus bases, and sometimes nimbostratus. 3. A scheme of classifying clouds according to their particulate composition; namely water clouds, ice-crystal clouds, and mixed clouds. The first are compose

COLREGS

Convention on the International Regulations for Preventing Collisions at Sea

LL

International Convention on Load Lines, 1966, as amended

STCW

International Convention on Standards of Training, Certification and Watchkeeping for Seafarers, 1978, as amended

SAR

Search and Rescue/International Convention on Maritime Search and Rescue, 1979

CONVENTIONAL CURRENT DIRECTION

The convention that current flows from an area of positive charge to one of negative charge. In reality the electrons, and hence the current, travel from an area of negative charge to one of positive charge.
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