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A hatched patch drawn offshore.
Also known as: Coral reef mark, Ganshō mark
Denotes a rock or coral reef on a Japanese topographic map.
Marks a rock or coral reef on a GSI topographic sheet.
Contexts: Maps
Appears in the water area of a topographic sheet, which carries far less marine detail than a nautical chart of the same coast, so the topographic reef symbol is not a navigational aid.
Contexts: Maps
A small irregular outline filled with short hatching lines, drawn in the water area away from the coastline.