Live feeds (GTFS & custom)

A live feed source brings real-time positions onto the map from an external feed, rather than from a table in Fabric. It's the source behind live vehicle tracking.

Feed types

• GTFS-Realtime — the standard for public-transport vehicle positions. Optionally add a GTFS static timetable (a zip) to bring in stop names and route colors.
• Custom JSON feed — any JSON endpoint that returns positions; point Icon Map at the URL and map its fields to a location.

Keeping it live

Set an auto-refresh interval so Icon Map re-fetches the feed and the map updates as positions change. Combine with the Vehicle tracker layer for trails, animation, and route snapping.

Next steps

• Vehicle tracker — animate the feed on the map.
• Data sources overview — common configuration.