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Public-images-osm logo.svg seamark:type = platform
Osm element tag.svg
A permanent offshore structure, either fixed or floating, used in the production of oil or natural gas.
Used on these elements
may be used on nodesshould not be used on waysmay be used on areasshould not be used on relations
Status: In use

Offshore platform

The tags defined on this page will render in various nautical charts.

This page defines values for the "seamark:platform:category" tags and other attributes applied to offshore platforms.

Object S-100 OSM Element object key IHO Definition
Offshore platform OFSPLF NodeArea platform A permanent offshore structure, either fixed or floating, used in the production of oil or natural gas.


Classification of an offshore raised structure.

Category (CATOFP) seamark:platform:category Definition
Oil derrick/rig oil A temporary mobile structure, either fixed or floating, used in the exploration stages of oil and gas fields.
Production platform production A term used to indicate a permanent offshore structure equipped to control the flow of oil or gas. It does not include entirely submarine structures.
Observation/research platform observation A platform from which one's surroundings or events can be observed, noted or recorded such as for scientific study.
Articulated loading platform (ALP) alp A metal lattice tower, buoyant at one end and attached at the other by a universal joint to a concrete filled base on the sea bed. The platform may be fitted with a helicopter platform, emergency accommodation and hawser/hose retrieval.
Single anchor leg mooring (SALM) salm A rigid frame or tube with a buoyancy device at its upper end , secured at its lower end to a universal joint on a large steel or concrete base resting on the sea bed, and at its upper end to a mooring buoy by a chain or wire.
Mooring tower mooring A platform secured to the sea bed and surmounted by a turntable to which ships moor.
Artificial island artificial_island A man-made structure usually built for the exploration or exploitation of marine resources, marine scientific research, tidal observations, etc.
Floating production, storage and offloading vessel (FPSO) fpso An offshore oil/gas facility consisting of a moored tanker/barge by which the product is extracted, stored and exported.
Accommodation platform accommodation A platform used primarily for eating, sleeping and recreation purposes.
Navigation, communication and control buoy (NCCB) nccb A floating structure with control room, power and storage facilities, attached to the sea bed by a flexible pipeline and cables.

Other Attributes

Attribute (S-100) seamark:platform:<attribute> Value type Definition
Colour (COLOUR) colour List There is a set of standard colours defined in the S-100 attribute catalogue, see Seamarks/Colours#Colours.
Pattern (COLPAT) colour_pattern List A painted platform with more than one colour can be specified by listing those colours in a semi-colon separated list, see Seamarks/Colours#Colour Patterns.
Nature of construction (NATCON) construction List The platform's primary construction material, see Seamarks/General Attributes#Nature of construction (NATCON).
Condition (CONDTN) condition Enumeration See Seamarks/General_Attributes#Condition_.28CONDTN.29
Height (HEIGHT) height Decimal The value of the vertical distance to the highest point of the platform, measured from a specified vertical datum (typically, mean sea level). Example: Highest point of platform is 28.5 m above MSL. Answer: seamark:platform:height=28.5.]
Product (PRODCT) product List See Seamarks/General_Attributes#Product_.28PRODCT.29
Conspicuous, radar (CONRAD) reflectivity Enumeration Platform's ability to be detected by radar, see Seamarks/General_Attributes#Conspicuous.2C_radar_.28CONRAD.29
Conspicuous, visually (CONVIS) visibility Enumeration Platform's ability to be clearly seen and identified, see Seamarks/General_Attributes#Conspicuous.2C_visually_.28CONVIS.29


Seamark Tag Values
Seamark Objects
Seamark Attributes
INT-1 Cross Reference