Maps & Display
Goal: choose a tile source, make sure coordinates do not drift, download offline tiles when needed.
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Pick tile sources#
Entry: Map tab → tile / map menu. Pick by purpose:
| Source | When to use it |
|---|---|
| AMap / AMap satellite | aligns perfectly with Chinese positioning (GCJ-02) |
| Vector map | rendered on the client, crisp at any zoom, no API key, WGS-84 — the default pick |
| Carto light / dark / voyager | raster tiles; dark tiles for dark mode |
| OSM standard / humanitarian | general-purpose base |
| OpenTopo | contours and terrain |
| Esri street / imagery | streets / satellite imagery |
✅
Check: after switching, your marker must not jump more than 500 m — if it does, datum correction is not applied, see next.
No drift: WGS-84 ↔ GCJ-02#
🗺️
APRS uses WGS-84 worldwide; Chinese sources (AMap) use GCJ-02. The app converts both ways — Chinese sources are aligned to GCJ-02 and restored when you switch back — so switching layers never moves you by 500 m; stations, tracks and your own marker move together.
- Manual coordinates are entered as WGS-84; picking a point on the map converts internally.
- A whole layer looks offset: check which datum it uses, then whether “offline tiles only” is serving a stale cache.
Download offline maps#
- Pan and zoom the map to the screen you want to keep — the download area is exactly what you see (no box selection).
- Settings → Display → Offline map (or the offline entry in the map menu) → download.
- Resumable; capped at 200k tiles (~3 GB) per region.
- Then enable offline tiles only: zero network requests, fully offline.
⚠️
The web build offers no download (browsers have no stable writable directory) — use Android or Windows for offline maps.
Look and feel#
- UI 2.0: the map-first layout (default); Display settings switches back to the classic one at any time; material toggles between frosted glass and mica.
- Dark mode: Settings → Display → dark mode (follow system / force on / force off).
- Themes (Settings → Themes): 17 colour tokens, icons, text and background are editable and exportable as JSON; UI scaling runs 85–130%.
- The weather widget switch is on the same page — off means the home weather card stops requesting data.