English

In British terminology, a new printing of an existing CHART embodying the latest informa­tion received in the Hydro­graphic Department. The CHART is entirely revised throughout and modernized in style, all copies of the CHART in circulation being cancelled. When a new edition is published the LARGE and SMALL CORRECTIONS dates are removed (these corrections being embodied in the new edition). In U.S. terminology, a new printing of an existing CHART embodying corrections that have become so extensive or of such importance to NAVIGATION as to render all previous printings obsolete.

In U.S. terminology, a new issue of a CHART embodying only minor corrections. Such corrections are applied to the NEGATIVES and a new printing plate made. New prints do not render previous printings of the current edition obsolete.

In U.S. terminology, the date when a NEW PRINT of a CHART is issued which embodies changes or corrections of a relatively minor character. The new print date is added to the right of the edition date in the lower left-hand corner of the CHART.

Large blocks of CORAL torn loose from the outer face of a REEF and tossed on to the REEF FLAT by STORM WAVES or TSUNAMIS. The blocks are blackened by a crust of lichens after detachment from the REEF.

A ROUTEING measure comprising an area within defined limits where anchoring is hazardous or could result in unacceptable damage to the marine environment. Anchoring in a no anchoring area should be avoided by all ships or certain classes of ships, except in case of immediate danger to the ship or the persons on board.

A genus of usually pale pink luminescent dinoflagellates large enough to be seen by the unaided eye. This particular organism is responsible for much of the sheet-type LUMINESCENCE noted in coastal waters of various parts of the world OCEAN.

In optics, one of the two points on the OPTICAL AXIS of a LENS (or a system of LENSES) such that a RAY emergent from the second point is parallel to the RAY incident at the first. The first nodal point is referred to as the front nodal point or incident nodal point,and the second nodal point as the rear nodal point or emergent nodal point. An AMPHIDROMIC POINT. In ASTRONOMY, a NODE.