{
  "title": "Manx Skipper — the southern passages",
  "scope": "Original browser game. Geography is shared with Manx Wire's Ronaldsway Flight and Derbyhaven Wingfoil. Vessel models and handling are simplified visual interpretations, not navigation or training products.",
  "vessels": {"authoring": "Original procedural models created for Manx Wire; glTF binary, Y up, bow toward -Z, waterline y=0. Named camera anchors are preserved for reuse.", "ben-my-chree_reference": "https://assets.publishing.service.gov.uk/media/547c6fb7e5274a4290000049/BenMyChreeReport.pdf", "manannan_reference": "https://incat.com.au/vessel/hull-050/", "rib": "Original fictional coastal RIB, with twin outboards."},
  "coastline_buildings_piers": {"source": "OpenStreetMap contributors", "licence": "ODbL", "url": "https://www.openstreetmap.org/copyright", "existing_site_notes": "/games/flight/south-coast-source.json"},
  "terrain": {"source": "Mapzen / Tilezen terrain; SRTM and GMTED2010 courtesy of USGS, Copernicus EU-DEM, NOAA ETOPO1", "url": "https://github.com/tilezen/joerd/blob/master/docs/attribution.md", "processing": "Resampled terrain and simplified collision coastline for browser play."},
  "imagery": {"credit": "Contains modified Copernicus Sentinel-2 data (2025)", "existing_site_notes": "/games/flight/visual-assets-source.json"},
  "sky_and_materials": {"source": "Poly Haven", "licence": "CC0", "url": "https://polyhaven.com/license", "existing_site_notes": ["/games/wingfoil/sky-source.json", "/games/flight/visual-assets-source.json"]},
  "surface_detail": "Sea chop, whitecaps, wake foam and spray, and the rubberised, non-slip, stainless and gloss finishes on the boats, are procedural: generated in the browser from small formulas, with no extra textures downloaded. Harbour piers and quays use the Poly Haven rustic stone wall (CC0) listed in /games/flight/visual-assets-source.json.",
  "audio": "Original optional synthesised machinery and horn; no sound recordings.",
  "passages": "Port St Mary to Derbyhaven around Langness, or to Port Erin outside the Calf. Ferries start and finish offshore. Routes are game objectives, not navigation advice."
}