The web 3D viewer uses MapLibre GL JS 6.10.0, licensed under the BSD 3-Clause licence and bundled third-party notices.
Elevation and hill shading use Mapterhorn terrain tiles. See Mapterhorn data-source attribution and licences for the contributing datasets. Source checked 16 September 2026.
Ground maps: © OpenStreetMap contributors. Aviation maps contain information from the open flightmaps database.
Terrain and GPS heights are approximate, may use different altitude references, and do not reliably include obstacles. The vertical-scale setting exaggerates both terrain and aircraft altitude. Labels keep the original reported feet. These maps are not for navigation, terrain-clearance assessment or collision avoidance.
Recorded tracks use reported GPS altitude rather than adding their height above the terrain. Parts can disappear behind terrain. Missing altitude is not replaced with an invented altitude. Event/history access and retention are unchanged.