Country EEZ Layer and Vessel Filter

Feature Request

Add Exclusive Economic Zone boundaries to Fathom as a named operational map layer and vessel filter, including validated operational coverage for priority regions such as West Africa.

User Story

As a Maritime Operations Officer or analyst, I want to view and filter vessels by country EEZ in Fathom, so that I can quickly understand jurisdictional context, identify vessels operating in relevant national zones, and prepare operational briefings without switching to ArcGIS, GeoStore, or external map tools.

Acceptance Criteria

• EEZ boundaries are available as a toggleable layer in the Fathom layers panel.
• EEZs are named by country/authority and are searchable/selectable.
• Users can filter vessels by one or more selected EEZs.
• The EEZ filter works with vessel type, flag, tags, lists, selected vessels, and other existing Fathom filters.
• EEZ boundaries render clearly without obscuring AIS tracks, vessel icons, or operational overlays.
• Boundary source and update cadence are documented internally.
• Initial rollout includes validated West Africa coverage, including Nigerian Navy-recognised EEZ boundaries where they differ from generic EEZ datasets, or clearly records any source/data limitation.