The :feature:map module provides the mapping interface for the application. Map rendering is decomposed into three focused CompositionLocal provider contracts, each with per-flavor implementations in :app.

Architecture

Provider Contracts (in `core:ui/commonMain`)

Contract	Purpose	Implementations
`MapViewProvider`	Main map (nodes, waypoints, controls)	`GoogleMapViewProvider`, `FdroidMapViewProvider`
`NodeTrackMapProvider`	Per-node GPS track overlay (embedded in `PositionLogScreen`)	Google: `NodeTrackMap` → `MapView(GoogleMapMode.NodeTrack)`, F-Droid: `NodeTrackMap` → `NodeTrackOsmMap`
`TracerouteMapProvider`	Traceroute route visualization	Google: `TracerouteMap` → `MapView(GoogleMapMode.Traceroute)`, F-Droid: `TracerouteMap` → `TracerouteOsmMap`

All providers are injected via CompositionLocal in MainActivity.kt and consumed by feature modules without direct dependency on Google Maps or osmdroid.

Shared ViewModels (in `commonMain`)

BaseMapViewModel — Core contract for all map state management, node markers, camera positions, and traceroute node selection logic (TracerouteNodeSelection, tracerouteNodeSelection()).
NodeMapViewModel — Shared logic for per-node map views (track display, position history).

Key Data Types

TracerouteOverlay (core:model/commonMain) — Pure data class representing traceroute route segments. Extracted from feature:map for cross-module reuse.
TracerouteNodeSelection (feature:map/commonMain) — Data class modeling node selection results during traceroute visualization.
GeoConstants (core:model/commonMain) — Centralized geographic constants (DEG_D, HEADING_DEG, EARTH_RADIUS_METERS).

Map Providers

Google Maps (google flavor): Uses Google Play Services Maps SDK. Implementations in app/src/google/kotlin/org/meshtastic/app/map/.
OpenStreetMap (fdroid flavor): Uses osmdroid for a fully open-source experience. Implementations in app/src/fdroid/kotlin/org/meshtastic/app/map/.

Features

Live Node Tracking: Real-time position updates for nodes on the mesh.
Waypoints: Create and share points of interest.
Per-Node Track Overlay: Embedded map in PositionLogScreen showing a node's GPS track history.
Traceroute Visualization: Dedicated map view showing route segments between mesh nodes.
Offline Maps: Support for pre-downloaded map tiles (via osmdroid).

Module dependency graph

graph TB
  :feature:map[map]:::kmp-feature

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README.md

:feature:map

Overview