Overview

OpenSeaNav is a versatile tool for marine navigation and monitoring, designed for NMEA0183-compatible devices. It enables real-time display, logging, and forwarding of navigation data with integrated map visualization, using free and open-source charts.

Features

NMEA Device Connection

• Connect any NMEA0183-compatible device via Serial, TCP, or UDP.
• Supports multiple simultaneous device connections.

NMEA Monitoring

• Display both raw NMEA sentences and decoded data in real-time.
• Supports standard sentences including GGA, RMC, GSV, and more.
• Live updates of position, heading, speed, and other navigation metrics.

Map Display

• Integrated OpenStreetMap panel shows live boat position.
• Tracks routes, heading, and course over ground.
• Overlay options include OpenSeaMap nautical charts.

Data Forwarding

• Forward received NMEA data to UDP and/or secondary serial ports.
• Supports multiple targets and protocols simultaneously.

Selective Output Control

• Filter sentence types per output stream.
• Forward only selected sentences (e.g., GGA, RMC) to different outputs.

Data Logging

• Record received data in multiple formats: TXT, CSV, NMEA, LOG.
• Timestamped logs for historical review and analysis.

User Interface

• Live dashboards and widgets for quick overview of navigation data.
• Configurable panels for both map and raw/decoded data views.

Configuration Overview

• Input: Serial / TCP / UDP
• Output: Serial / UDP / Logs
• Map & Layer: Internet connection

Screenshots

Map & Navigation View

Data Monitoring & Widgets

Project Status

OpenSeaNav is a non-commercial personal project created for learning purposes and to support the marine and open-source community. Many improvements and new features are expected as the project evolves.

Contributing

• Contributions are welcome via Pull Requests.
• Report bugs and feature requests in the GitHub Issues section.
• Use the GitHub Discussions section for questions, ideas, and general discussion.

Supported Platforms

• Windows 10/11
• Linux
• macOS (not tested)

Dependencies (Qt6)

• Core, Gui, Widgets
• SerialPort, Network
• Quick, Location, Positioning

Data Sources & Attribution

• OpenStreetMap (www.openstreetmap.org)
• OpenSeaMap (www.openseamap.org)

Disclaimer

This software is not certified for navigation.
Charts and data are provided for informational purposes only and must not be relied upon as a primary means of navigation.

Licence

This project is licensed under the Apache License 2.0
© Kupofty 2025-2026.

You are free to use, modify, and distribute the software, provided proper attribution is included and the license terms are followed. See the LICENSE file for full details.