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Public-images-osm logo.svg Prefix seamark:*
Horswell rock east cardinal buoy.jpg
Defines IHO seamarks that are used as navigational aids. Show/edit corresponding data item.
Group: marine navigation
Used on these elements
may be used on nodesmay be used on waysmay be used on areas (and multipolygon relations)may be used on relations
Status: in use
taginfo: seamark:*

information sign

This page describes a key prefix rather than a simple key.

seamark:*=* is a Namespace that indicates a feature defined by the International Hydrographic Organization (IHO), responsible for nautical chart standards.

Tags of the form seamark=* are not part of this namespace (however, the tags seamark=buoy and seamark=beacon have been used several thousand times).

How to map

All nautical objects tagged within the seamark:*=* namespace must include a seamark:type=* tag, which indicates a particular navigational feature that is used in sea charts. For rendering in nautical charts, this tag must be used to indicate the principal symbol to be displayed.

For further information, see:


See seamark:type=*