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AB

Certificated and experienced seaman ranked above ordinary seaman.

Related Terms

OPTOPHONE

[ENG ACOUS] A device with a photoelectric cell to convert ordinary printed letters into a series of sounds; used by the blind.

LEAD RAIL

In an ordinary rail switch, the turnout rail lying between the rails of the main track.

EP (EXTREME PRESSURE) LUBRICANTS

Lubricants that impart to rubbing surfaces the ability to carry appreciably greater loads than would be possible with ordinary lubricants without excessive wear or damage.

MATELOT

A traditional royal navy term for an ordinary sailor.

UNSEAWORTHINESS

The state or condition of a vessel when it is not in a proper state of maintenance, or if the loading equipment or crew, or in any other respect is not ready to encounter the ordinary perils of sea.

BERM

A nearly horizontal portion of a beach or backshore having an abrupt fall and formed by wave deposition of material and marking the limit of ordinary high tides. Also called BEACH BERM.

PROPANE

A paraffin hydrocarbon (C3H8) that is a gas at ordinary atmospheric conditions but easily liquefied under pressure.

ORDINARY

With respect to tides, the use of this non technical term has, for the most part, been determined to be synonymous with mean.

HYDROGRAPHIC SEXTANT

A surveying sextant similar to those used for celestial navigation but smaller and lighter, constructed so that the maximum angle that can be read on it is slightly greater than that on the navigating sextant. Usually the angles can be read only to the nearest minute by means of a vernier. It is fitted with a telescope with a large object glass and field of view. Although the ordinary navigating sextant may be used in place of the hydrographic sextant, it is not entirely satisfactory for use in observing objects ashore which are difficult to see. Hydrographic sextants are either not provided with shade glasses or they are removed before use.

OS

Ordinary seaman.

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