- offshore safety zone: 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. (IHO Dictionary, S-32, 5th Edition,
- nature reserve: a tract of land managed so as
to preserve it's flora, fauna, physical features, etc.
- bird sanctuary: a place where birds are bred
- game reserve: a place where wild animals or
birds hunted for sport or food are kept undisturbed for private use.
- seal sanctuary: a place where seals are
- degaussing range: an area, usually about two
cables diameter, within which ships' magnetic fields may be measured; sensing instruments
and cables are installed on the sea bed in the range and there are cables leading from the
range to a control position ashore. (IHO Chart Specifications, M-4)
- military area: an area controlled by the
military in which restrictions may apply. (Hydrographic Service, Royal Australian Navy)
- historic wreck area: an area around certain
wrecks of historical importance to protect the wrecks from unauthorized interference by
diving, salvage or deposition (including anchoring). (IHO Chart Specifications, M-4)
- navigational aid safety zone: an area around a
navigational aid which vessels are prohibited from entering.
- minefield: an area laid and maintained with
explosive mines for defence or practice purposes.
- swimming area: an area in which people may
swim and therefore vessel movement may be restricted.
- waiting area: an area reserved for vessels
waiting to enter a harbour.
- research area: an area where marine research
- dredging area: an area where dredging is
- fish sanctuary: a place where fish are
- ecological reserve: a tract of land managed so
as to preserve the relation of plants and living creatures to each other and to their
- no wake area: an area in which a vessels'
speed must be reduced in order to reduce the size of the wake it produces.
- swinging area: an area where vessels turn.
(Service Hydrographique et Océanographique de la Marine, France)
- water skiing area: an area whitin which people may water ski and therefore vessel movement may be restricted.
- Environmentally Sensitive Sea Area (ESSA): a generic term which may be used to describe a wide range of areas, considered sensitive for a variety of environmental reasons. (IHO Chart Specifications, M-4)
- Particularly Sensitive Sea Area (PSSA): an area that needs special protection through action by IMO because of its significance for regional ecological, socio-economic or scientific reasons and because it may be vulnerable to damage by international shipping activities. (IHO Chart Specifications, M-4)