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