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feat: MeshCore SAR - Flutter BLE mesh radio companion app
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Janez T
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# MeshCore SAR: Off-Grid Communication for Search & Rescue Operations
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When the grid goes down, lives are on the line. MeshCore SAR is a revolutionary mobile application that enables search and rescue teams to communicate, coordinate, and share critical information—even when cellular networks and internet connectivity are completely unavailable.
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Built on cutting-edge mesh networking technology, MeshCore SAR transforms ordinary smartphones into powerful off-grid communication devices using low-power radio hardware. Whether you're coordinating a wilderness rescue, managing a disaster response, or operating in remote areas, MeshCore SAR keeps your team connected when it matters most.
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## Why MeshCore SAR?
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Traditional communication systems fail when you need them most:
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- **Cellular networks** collapse during disasters or don't exist in remote wilderness
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- **Satellite phones** are expensive and have limited messaging capabilities
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- **Radio systems** require licensing and lack modern features like GPS integration
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MeshCore SAR solves these problems by creating a resilient, self-healing mesh network that:
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- ✅ **Works completely off-grid** - No cellular, WiFi, or internet required
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- ✅ **Extends range through mesh routing** - Messages hop through nearby devices
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- ✅ **Integrates GPS tracking** - Real-time location sharing on offline maps
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- ✅ **Specializes in SAR operations** - Purpose-built features for emergency response
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- ✅ **Uses affordable hardware** - Low-cost LoRa radios via Bluetooth
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---
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## 🗨️ Messages: Reliable Communication When Networks Fail
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[*Image placeholder: Messages screen showing conversation with delivery status*]
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At the heart of MeshCore SAR is a robust messaging system designed for mission-critical communication.
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### Key Features:
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**🎯 Multiple Communication Modes**
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- **Direct Messages**: Private one-to-one communication with team members
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- **Public Channel**: Broadcast updates to all nearby devices
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- **Rooms**: Persistent message storage for coordination centers
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**📡 Smart Message Delivery**
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- **Intelligent routing**: Messages automatically find the best path through the mesh network
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- **Delivery confirmation**: Know when your message reaches its destination with ACK tracking
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- **Automatic retries**: Failed messages retry automatically with progressive timeouts
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- **Flood fallback**: Critical messages use broadcast mode if routing fails
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**🚨 SAR Marker Messages**
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Send location-tagged alerts with a simple message format:
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- **🧑 Found Person**: `S:🧑:37.7749,-122.4194:Survivor located, needs medical attention`
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- **🔥 Fire Location**: `S:🔥:40.7128,-74.0060:Wildfire spreading rapidly northeast`
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- **🏕️ Staging Area**: `S:🏕️:34.0522,-118.2437:Base camp established with supplies`
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These special messages automatically appear as markers on the map, making critical information instantly visual for the entire team.
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**📊 Message Status Tracking**
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Every message shows its delivery status:
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- ⏳ **Sending** - Message is being transmitted
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- ✅ **Sent** - Message queued with expected acknowledgment
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- ✔️✔️ **Delivered** - Confirmation received with round-trip time
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- 🔄 **Retrying** - Automatic retry in progress
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- ❌ **Failed** - Delivery unsuccessful after all attempts
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**🌍 Multilingual Support**
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Full localization in English, Croatian (Hrvatski), and Slovenian (Slovenščina) ensures teams can communicate in their native language.
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---
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## 👥 Contacts: Know Your Team's Status and Location
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[*Image placeholder: Contacts list showing team members with GPS locations and battery levels*]
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MeshCore SAR's contact system goes beyond simple names and numbers—it provides real-time situational awareness for your entire team.
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### Contact Intelligence:
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**📍 Real-Time Location Tracking**
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- GPS coordinates automatically broadcast at configurable intervals
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- Location history tracking (last 100 positions per contact)
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- Distance and bearing calculations from your position
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- "Last seen" timestamps for situational awareness
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**🔋 Battery Monitoring**
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- Battery percentage displayed for each team member
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- Voltage telemetry via Cayenne LPP format
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- Early warning when team members need to conserve power
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**🛤️ Mesh Network Routing**
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The app shows routing information for each contact:
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- **Direct (0 hops)**: Connected directly to your radio
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- **Good path (1-2 hops)**: Reliable routing through 1-2 intermediate devices
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- **Medium/Long path (3-5+ hops)**: Extended range through multiple hops
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- **No path (flood mode)**: Messages broadcast to entire network
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**👔 Role-Based Identification**
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- Add emoji prefixes to names (🧑🏻🚒 for firefighter, 👮 for police, 🏥 for medical)
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- Instant visual identification on map and in contact lists
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- Customizable display names
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**📡 Contact Types**
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- **Chat** (Team Members): Standard team members shown on map
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- **Repeater**: Network infrastructure nodes that extend range
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- **Room**: Message servers with persistent storage and login capabilities
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**📞 Contact Sharing**
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- Export contacts as business cards
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- Share contacts directly over the mesh network
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- Import contacts from other team members
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---
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## 🗺️ Map: Offline Navigation and Tactical Awareness
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[*Image placeholder: Map screen showing team members, SAR markers, and offline terrain*]
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The map is where everything comes together—combining team locations, SAR events, and offline navigation into a single, comprehensive tactical display.
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### Map Features:
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**🗺️ Offline Vector Maps**
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- **MBTiles format**: Lightweight vector maps that work completely offline
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- **Multiple layers**: Street maps (OpenStreetMap), topographic (OpenTopoMap), satellite imagery (ESRI)
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- **High zoom levels**: Street-level detail up to zoom level 19
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- **Smart caching**: Tiles cached locally for 30 days
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**📍 Team Member Tracking**
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Each team member appears on the map with:
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- Blue circle markers with role emoji
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- Battery level badge (green/yellow/red indicators)
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- Distance from your location
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- Tap to view detailed information and message directly
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**🚨 SAR Event Markers**
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Critical events appear as color-coded markers:
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- 🟢 **Green** - Found Person
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- 🔴 **Red** - Fire Location
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- 🔵 **Blue** - Staging Area
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- 🟣 **Purple** - Object
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- Time elapsed since report
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- Tap to navigate and view details
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**✏️ Map Drawing Tools**
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Collaborative tactical planning:
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- **Line drawings**: Sketch routes, boundaries, or directions
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- **Rectangle areas**: Mark zones, perimeters, or sectors
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- **8 color palette**: Red, blue, green, yellow, orange, purple, pink, cyan
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- **Share drawings**: Send to channel or specific rooms via mesh network
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- **Collaborative editing**: All team members see drawings in real-time
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- **Ultra-compact format**: Efficient JSON encoding reduces bandwidth usage by 37%
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**🧭 Detailed Compass Dialog**
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Ultra-compact location display:
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- Current GPS coordinates
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- Toggle between Decimal Degrees (DD) and Degrees/Minutes/Seconds (DMS)
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- Tap outside to close (no buttons needed)
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- Perfect for quick location checks
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**📡 User Location Tracking**
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- Blue pulsing circle shows your current position
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- Navigation icon for direction
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- Tap to center and track your movement
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- Configurable accuracy settings
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**📊 Map Legend**
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Collapsible legend in top-right corner:
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- Team member count
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- SAR marker count by type
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- Quick reference for marker colors
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**🎯 Smart Navigation**
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- Tap any SAR marker in messages to navigate on map
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- Automatic tab switching
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- Map centers and zooms to selected location
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- Clears navigation after viewing
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---
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## 🔧 Technical Innovation
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### Mesh Network Protocol
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- **MeshCore Protocol**: Open-source, battle-tested mesh networking
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- **LoRa Radio**: Long-range, low-power wireless technology
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- **BLE Connection**: Smartphone connects to companion radio via Bluetooth
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- **Intelligent routing**: Self-healing paths through the network
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- **Flood mode fallback**: Guaranteed delivery for critical messages
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### Smart Features
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- **Adaptive location broadcasting**: Only sends updates when you move significantly
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- **Progressive retry logic**: Failed messages retry with increasing timeouts
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- **Cayenne LPP telemetry**: Standardized sensor data format
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- **Contact synchronization**: Automatic contact list updates
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- **Message persistence**: Rooms store messages for later retrieval
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### Built for Reliability
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- **Provider-based architecture**: Efficient state management
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- **Automatic reconnection**: Handles radio disconnections gracefully
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- **Message queue management**: Synchronizes messages in order
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- **Battery optimization**: Configurable tracking intervals
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- **Memory management**: Automatic history cleanup
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---
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## 🌟 Real-World Applications
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**Search & Rescue Operations**
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- Wilderness rescue coordination
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- Missing person searches
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- Cave rescue operations
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- Mountain rescue teams
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**Disaster Response**
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- Hurricane and flood response
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- Earthquake emergency communication
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- Infrastructure failure scenarios
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- Mass casualty incidents
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**Remote Operations**
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- Forestry operations
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- Mining site communication
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- Border patrol and security
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- Wildlife management
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**Training & Exercises**
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- Team coordination drills
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- Radio discipline training
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- Navigation exercises
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- Emergency preparedness
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---
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## 🚀 Getting Started
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MeshCore SAR works with affordable LoRa companion radios that connect to your smartphone via Bluetooth. The app handles all the complexity—you just:
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1. **Connect** your radio via Bluetooth
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2. **Add contacts** to your team
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3. **Start messaging** and tracking locations
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4. **Download maps** for your area
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5. **Coordinate** your mission
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No cellular service. No internet. No limits.
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---
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## 🌍 Open Source & Community-Driven
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MeshCore SAR is built on the open-source MeshCore protocol, fostering a community of developers and users who contribute to its continuous improvement. Whether you're a first responder, amateur radio enthusiast, or outdoor adventurer, you're part of a global network working to keep people connected when it matters most.
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---
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## 💡 The Future of Off-Grid Communication
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In a world increasingly dependent on fragile infrastructure, MeshCore SAR represents a paradigm shift: resilient, decentralized communication that works when everything else fails. As climate change drives more frequent disasters and teams operate in increasingly remote locations, mesh networking isn't just an alternative—it's essential.
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**MeshCore SAR isn't just an app. It's a lifeline.**
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---
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*MeshCore SAR is compatible with iOS 13+ and Android API 21+. Requires compatible LoRa companion radio hardware.*
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**Repository**: [github.com/meshcore-dev/meshcore.js](https://github.com/meshcore-dev/meshcore.js)
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---
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## 📸 Screenshots
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*[Placeholder sections for images]*
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### Messages
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*Screenshot showing conversation with delivery status, SAR marker messages, and message options*
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### Contacts
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*Screenshot showing contact list with GPS locations, battery levels, and routing information*
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### Map - Team View
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*Screenshot showing map with multiple team members, distance indicators, and user location*
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### Map - SAR Markers
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*Screenshot showing map with various SAR markers (person, fire, staging area) and color coding*
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### Map - Drawing Tools
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*Screenshot showing map with line and rectangle drawings, color palette, and toolbar*
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### Map - Offline Layers
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*Screenshot showing different map layers (street, topographic, satellite) selection*
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### Settings
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*Screenshot showing connection status, radio parameters, and location tracking settings*
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### Contact Details
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*Screenshot showing detailed contact information, telemetry data, and message history*
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---
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**Ready to experience off-grid communication?** Connect your radio and join the mesh network today.
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