DMRmap

A web app that visualizes DMR repeaters on an interactive map. Filter by band and network, search by callsign or address, find repeaters along a driving route, and export CPS-ready channel configurations.

Live: https://dmrmap.kida.io

Features

Interactive OpenStreetMap with repeater markers (blue = VHF/2m, red = UHF/70cm)
Band filtering (2m / 70cm) and network filtering (BrandMeister, DMR+, TGIF, Other)
Toggle visibility of personal hotspots and inactive repeaters
Free-text search by callsign, city, or DMR ID
Address-to-address routing via OSRM with adjustable corridor width
Click-to-pin with adjustable radius search
Detailed repeater popups (frequencies, color code, timeslots, hardware, power, antenna height, BrandMeister status)
Real-time Last Heard heatmap via BrandMeister WebSocket
CPS Studio: manage talk groups, set timeslots, export Motorola CPS 2.0 compatible XML
Coordinate display with Maidenhead grid locator
Dark mode (follows system preference)
Internationalization (English, German, Spanish, French, Italian, Polish)
No external CDN dependencies — all assets served locally

Tech Stack

Backend: Go (stdlib net/http), PostgreSQL 17 via pgx/v5, migrations via goose/v3
Frontend: Vanilla JavaScript, Leaflet, i18next — no build step
Infrastructure: Docker Compose, multi-stage Dockerfile

External Services

Service	Usage	Auth
RadioID	Repeater database (seeded from `rptrs.json` dump)	None
BrandMeister API	Device status sync (`/v2/device/{id}`), talk group registry (`/v2/talkgroup`)	None (public read)
BrandMeister WebSocket	Real-time Last Heard feed for heatmap via socket.io	None
Nominatim	Address geocoding and autocomplete (client-side)	None
OSRM	Driving route calculation (client-side)	None

The BrandMeister talk group registry is fetched once at Docker build time and bundled as static/talkgroups.json. It is used for talk group name resolution and autocomplete in CPS Studio.

Running with Docker

docker compose up --build

Open http://localhost:8080. PostgreSQL data is persisted in a named volume.

Development

Hot-reload with air:

docker compose -f compose.dev.yml up --build

The dev container mounts the project directory, so changes to Go and frontend files are picked up automatically.

Environment Variables

Variable	Default	Description
`DATABASE_URL`	`postgres://dmrmap:dmrmap@localhost:5432/dmrmap?sslmode=disable`	PostgreSQL connection string
`JSON_PATH`	`rptrs.json`	Path to RadioID repeater dump
`BMRPTRS_PATH`	`bmrptrs.json`	Path to BrandMeister repeater dump
`LISTEN_ADDR`	`:8080`	HTTP listen address
`BM_SYNC`	(disabled)	Set to `true` to enable periodic BrandMeister device sync
`ADMIN_TOKEN`	(disabled)	Set to enable the admin interface at `/admin/`

API Endpoints

Method	Path	Description
GET	`/api/repeaters`	Repeaters within map bounding box (query: `minLat`, `maxLat`, `minLng`, `maxLng`, `band`, `network`, `hotspots`, `inactive`)
GET	`/api/repeaters/radius`	Repeaters within radius of a point (query: `lat`, `lng`, `radius`)
POST	`/api/repeaters/route`	Repeaters along a route corridor (body: GeoJSON coordinates + `corridor` width)
GET	`/api/repeater`	Single repeater by ID (query: `id`)
GET	`/api/repeaters/search`	Free-text search (query: `q`)

Project Structure

├── main.go              # Route registration, env config
├── db.go                # DB queries, Repeater struct, geo helpers
├── handlers.go          # Public API handlers
├── admin.go             # Admin auth middleware + admin API
├── bmdevice.go          # BrandMeister device sync
├── migrations/          # SQL migrations (goose)
├── static/
│   ├── app.js           # Frontend application logic
│   ├── style.css        # Styles with dark mode support
│   ├── index.html       # Single-page HTML shell
│   ├── i18n.js          # i18next initialization
│   ├── locales/         # Translation files (en, de, es, fr, it, pl)
│   └── lib/             # Vendored JS libraries (Leaflet, i18next, socket.io)
├── Dockerfile           # Production multi-stage build
├── Dockerfile.dev       # Development image with air
├── compose.yml          # Production Docker Compose
└── compose.dev.yml      # Development Docker Compose

Data

Repeater data provided by RadioID. Availability and talk group data by BrandMeister. This project is not affiliated with or endorsed by RadioID or BrandMeister.

License

MIT

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