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	Eng ID	Term	Definition
	4441	river mouth	The exit or point of discharge of a river into the sea, a lake, or another river.
	4442	river roadstead	A ROADSTEAD which lies in a river.
	4443	rivulet	A small RIVER.
	4444	road(s)	See ROADSTEAD.
	4445	roadstead	An area near the SHORE, where vessels can anchor in safety; usually a shallow INDENTATION in the COAST. Also called road or roads. See OPEN ... more An area near the SHORE, where vessels can anchor in safety; usually a shallow INDENTATION in the COAST. Also called road or roads. See OPEN ROADSTEAD.
	4446	roaring forties	An expression often used to denote that belt in the OCEANS, between 40° and 50° south LATITUDE, where strong westerly WINDS prevail.
	4447	Roberts radio current meter	An electro-mechanical CURRENT METER which measures current speed and direction. This METER can be suspended below an anchored BUOY or ship w... more An electro-mechanical CURRENT METER which measures current speed and direction. This METER can be suspended below an anchored BUOY or ship which is equipped with a RADIO TRANSMITTER that transmits the current measurements to a ship or shore based monitor station.
	4448	rock	Any formation of natural origin that constitutes an integral part of the LITHOSPHERE. The natural occurring material that forms the firm, h... more Any formation of natural origin that constitutes an integral part of the LITHOSPHERE. The natural occurring material that forms the firm, hard, and solid masses of the ocean floor. An isolated rocky formation or a single large STONE, usually one constituting a danger to NAVIGATION. See ROCK AWASH, SUNKEN ROCKS, PINNACLE and ROCK WHICH COVERS AND UNCOVERS.
	4449	rock awash	A ROCK awash at CHART DATUM.
	4450	rock borer	A member of any of several families of bivalves that live in cavities they bore in soft ROCK, concrete and other material.
	4451	rocket	In hydrography or navigation, a pyrotechnic projectile used for signalling, or for life-saving purposes.
	4452	rocket sounding	Determination of one or more upper-air meteorological elements by means of rocket-borne instruments.
	4453	rocket station	A LIFE SAVING STATION equipped with line-carrying rocket apparatus.
	4454	rock flour	Finely ground rock particles, chiefly silt size, resulting from glacial ABRASION. A component of marine DEPOSITS off glacial stream mouths.
	4455	rockweed	One of a group of marine plants, principally of an order (Fucales) of the brown ALGAE, mostly multibranched and leathery, which grow attach... more One of a group of marine plants, principally of an order (Fucales) of the brown ALGAE, mostly multibranched and leathery, which grow attached to ROCKS in the INTERTIDAL ZONE by means of an organ called a holdfast. Also called wrack or fucus.
	4456	rock which covers and uncovers	A ROCK of small area (PINNACLE) that COVERS AND UNCOVERS at various states of the TIDE.
	4457	rocky area	An area with a rocky BOTTOM.
	4458	rod	A unit of length equal to 5.5 YARDS or 16.5 FEET. Also called PERCH or POLE. A STADIA or LEVELLING ROD. See also SOUNDING POLE.
	4459	rod: levelling	See LEVELLING ROD.
	4460	rod: range	See RANGE ROD.
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