en 06 sd card

6. SD Card Setup

The SD card is optional but strongly recommended for maps and data persistence.

Required format: FAT32

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Folder Structure

/LoRa_Tracker/
├── config.json          ← Device configuration
├── stats.json           ← Station statistics
├── MapTiles/            ← Raster tiles (JPEG/PNG)
│   └── REGION/
│       └── Z8/
│           └── X/
│               └── Y.jpg
├── VectMaps/            ← Vector tiles (NAV)
│   └── REGION/
│       ├── Z9.nav
│       ├── Z10.nav
│       └── ...
└── GPX/                 ← Recorded tracks
    └── track_YYYYMMDD_HHMMSS.gpx

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Raster Tiles (JPEG/PNG)

Raster tiles are standard OpenStreetMap images (XYZ/TMS format).

Recommended Download

Use MOBAC (Mobile Atlas Creator):

1. Select source: OpenStreetMap
2. Select the geographic area
3. Zoom levels: 8, 10, 12, 14 (Z8 alone is enough to start)
4. Output format: Custom → folder MapTiles/REGION_NAME/

File Naming

/LoRa_Tracker/MapTiles/FRANCE/Z8/X/Y.jpg

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Vector Tiles (NAV)

NAV tiles offer more detailed rendering at high zoom (Z9+). They are compatible with the IceNav-v3 format.

Generation

.nav files are generated from OpenStreetMap data using the IceNav conversion tool.

/LoRa_Tracker/VectMaps/FRANCE_SOUTH/Z9.nav
/LoRa_Tracker/VectMaps/FRANCE_SOUTH/Z10.nav
...
/LoRa_Tracker/VectMaps/FRANCE_SOUTH/Z15.nav

One .nav file per zoom level per region.

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Without SD Card

The tracker works without an SD card with reduced functionality:

Feature	Without SD
Raster map	Grey background only
Vector map	Not available
APRS symbols on map	Red circles
Messages	Not persistent (lost on reboot)
Station stats	Not persistent
GPX tracks	Not available
Configuration	Saved in internal flash