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	Eng ID	Term	Definition
	4501	saddle	A broad PASS or COL, resembling in shape a riding saddle in a RIDGE or between contiguous ELEVATIONS.
	4502	safety aids	See AID TO NAVIGATION.
	4503	safety fairway	An area within which permits are not granted for the erection of oil or gas related structures. The use of a safety fairway is not usually... more An area within which permits are not granted for the erection of oil or gas related structures. The use of a safety fairway is not usually mandatory, but is recommended.
	4504	safety zone	The area around an offshore installation within which vessels are prohibited from entering without permission. Special regulations protect i... more The area around an offshore installation within which vessels are prohibited from entering without permission. Special regulations protect installations within a safety zone and vessels of all nationalities are required to respect the zone.
	4505	SafetyNET	The international service for the broadcast and automatic reception of MARITIME SAFETY INFORMATION via the INMARSAT EGC system in waters whe... more The international service for the broadcast and automatic reception of MARITIME SAFETY INFORMATION via the INMARSAT EGC system in waters where an international NAVTEX service is not provided.
	4506	safe water mark	In the IALA Maritime Buoyage System a NAVIGATION MARK used to indicate that there is NAVIGABLE WATER around its POSITION with no known haza... more In the IALA Maritime Buoyage System a NAVIGATION MARK used to indicate that there is NAVIGABLE WATER around its POSITION with no known hazards nearby.
	4507	sag correction (tape)	See TAPE: SAG CORRECTION.
	4508	sailing	A method of solving the various problems involving COURSE, distance, DIFFERENCE OF LATITUDE, DIFFERENCE OF LONGITUDE and DEPARTURE. The ... more A method of solving the various problems involving COURSE, distance, DIFFERENCE OF LATITUDE, DIFFERENCE OF LONGITUDE and DEPARTURE. The various methods are collectively spoken of as 'the sailings'.
	4509	sailing: composite	A modification of GREAT-CIRCLE SAILING used when it is desired to limit the highest LATITUDE.
	4510	sailing: great circle	Any SAILING when a GREAT CIRCLE TRACK is involved.
	4511	sailing: Mercator	A mathematical solution of the plot as made on a MERCATOR CHART. It is similar to PLANE SAILING, but uses MERIDIONAL DIFFERENCE and DIFFER... more A mathematical solution of the plot as made on a MERCATOR CHART. It is similar to PLANE SAILING, but uses MERIDIONAL DIFFERENCE and DIFFERENCE OF LONGITUDE in place of DIFFERENCE OF LATITUDE and DEPARTURE, respectively.
	4512	sailing: meridian	Following a TRUE COURSE of 0° or 180°; SAILING along a MERIDIAN.
	4513	sailing: middle-latitude	A method of converting DEPARTURE into DIFFERENCE OF LONGITUDE, or vice versa, when the true COURSE is not 90° or 270°, by assuming that ... more A method of converting DEPARTURE into DIFFERENCE OF LONGITUDE, or vice versa, when the true COURSE is not 90° or 270°, by assuming that such a COURSE is steered at the MIDDLE LATITUDE.
	4514	sailing: parallel	A method of converting DEPARTURE into DIFFERENCE OF LONGITUDE, or vice versa, when the true COURSE is 90° or 270°.
	4515	sailing: plane	A SAILING in which the EARTH or a small part of it is considered a plane.
	4516	sailing: rhumb line	Any SAILING when a RHUMB LINE is involved.
	4517	sailing: spherical	Any of the SAILINGS which consider the spherical or spheroidal shape of the EARTH.
	4518	sailing: traverse	A method of determining the equivalent COURSE and distance made good by a craft following a TRACK consisting of a series of RHUMB LINES.... more A method of determining the equivalent COURSE and distance made good by a craft following a TRACK consisting of a series of RHUMB LINES. The problem is customarily solved by the principles of PLANE SAILING.
	4519	sailing chart	See under CHART.
	4520	sailing directions	Information published in book form describing COASTS, waters, CHANNELS, harbour facilities, etc., for use by mariners.
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