Use the “Quick Search” box to locate your required term and/or definition. The following “Search conditions” can be used to refine your search: “Contains”, “Begins with”, “Ends with”, “Equals”, “Does not contain” or “Does not equal.”
Eng ID Term Definition
5281
swash mark
The thin wavy line of fine SAND, mica scales, bits of SEAWEED, etc., left by the UPRUSH when it recedes from its upward limit of movement on... more
The thin wavy line of fine SAND, mica scales, bits of SEAWEED, etc., left by the UPRUSH when it recedes from its upward limit of movement on the BEACH.
5282
swashway
See SWASH.
5283
swath(e)
The strip or lane on the ground or SEAFLOOR scanned by the SWATH(E) SOUNDING SYSTEM when the SURVEY platform proceeds along its COURSE.
5284
swath(e) sounding system
A multi-beam system which is capable of obtaining a lane of soundings from a single ship's track.
5285
swath(e) system
Any of a number of systems which are capable of obtaining a strip or lane of ELEVATIONs or SOUNDINGs from a single SURVEY PLATFORMS’s TRACK.... more
Any of a number of systems which are capable of obtaining a strip or lane of ELEVATIONs or SOUNDINGs from a single SURVEY PLATFORMS’s TRACK.  In HYDROGRAPHY, systems that fall into this category are MULTI BEAM ECHO SOUNDERs (MBES), INTERFEROMETRIC ECHO SOUNDERs and LIDAR.
5286
sway
The side-to-side bodily motion of a ship, inde­pendent of ROLLING, caused by uniform pressure being exerted all along one side of the hull.
5287
sweep
(v.t. & i.). To tow a line or object below the surface, to determine the least depth in an area or to insure that a given area is free from ... more
(v.t. & i.). To tow a line or object below the surface, to determine the least depth in an area or to insure that a given area is free from navigational dangers to a certain depth; or the removal of such dangers.
5288
sweeping
The process of towing a line or object below the surface, to determine whether an area is free from isolated submerged dangers to vessels an... more
The process of towing a line or object below the surface, to determine whether an area is free from isolated submerged dangers to vessels and to determine the position of any dangers that exist, or to determi­ne the least depth of an area.
5289
swell
Ocean waves which have travelled out of their generating area. Swell characteristically exhibits a more regular and longer PERIOD and has fl... more
Ocean waves which have travelled out of their generating area. Swell characteristically exhibits a more regular and longer PERIOD and has flatter CRESTS than WAVES within their FETCH. Rising of the water of a RIVER above its usual LEVEL. Gently rising GROUND or a rounded HILL above the surrounding GROUND.
5290
swept area
An area that has been determined to be clear of navigational dangers to a specified DEPTH
5291
swing
In PHOTOGRAMMETRY, a rotation of a PHOTOGRAPH in its own plane about its camera axis.
5292
swinger
See FIX: CIRCULAR.
5293
swinging buoy
See COMPASS ADJUSTMENT BUOY.
5294
swinging ship
The process of placing a vessel on various HEADINGS and compar­ing MAGNETIC COMPASS rea­dings with the corresponding magnetic DIRECTIONS, to... more
The process of placing a vessel on various HEADINGS and compar­ing MAGNETIC COMPASS rea­dings with the corresponding magnetic DIRECTIONS, to determine DEVIATION. This usually follows COMPASS COMPENSATION (or ADJUSTMENT), and is done to obtain information for making a DEVIATION TABLE. Also called compass calibration, or calibration of compass. See COMPENSATION OF MAGNETIC COMPASS.
5295
swirl error
See ERROR.
5296
symbol
A CHARACTER, letter, or similar graphic repre­sen­tation used on a CHART, MAP, HYDROGRAPHIC SURVEY SHEET, or DIAGRAM to represent some objec... more
A CHARACTER, letter, or similar graphic repre­sen­tation used on a CHART, MAP, HYDROGRAPHIC SURVEY SHEET, or DIAGRAM to represent some object, quantity, charac­teristic, etc.
5297
synodical month
See MONTH.
5298
synodic (or synodical) period
The interval of time between any planetary configuration of a CELESTIAL BODY, with respect to the SUN, and the next successive same configur... more
The interval of time between any planetary configuration of a CELESTIAL BODY, with respect to the SUN, and the next successive same configuration of that body, as from INFERIOR CONJUNCTION to INFERIOR CONJUNCTION.
5299
synoptic analysis
Sea WEATHER ANALYSIS.
5300
synoptic chart (or map)
See CHART (or MAP): WEATHER.