Observed arrival · 2026-08-27

Seamarks: The Rocks That Charts Miss

seamarks.app Observed source

Editorial interest 88/100 Selection signal · not a rating of the site

A prototype coastal-hazard map compiling 21 reefs, shoals, waves, and local navigation marks from public sources in four languages.

Landing page captured for the 2026-08-27 issue.

Field notes

The project encodes confidence directly into its cartography: solid dots mark source-published positions, while dashed circles preserve uncertainty rather than inventing coordinates. It also records local practice, including a 235 m southern approach to Marmagkas bay and transit marks that can be read visually without GPS. The collection currently spans the Ionian and Basque coasts and draws on public material in four languages.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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