4 is a free and open-source external GPS companion designed for Euro Truck Simulator 2 and American Truck Simulator. It provides a second-screen navigation experience, allowing users to turn off the in-game HUD and instead use a real-world style navigation unit on a phone, tablet, or secondary monitor for greater immersion while driving in the simulators.
The tool features real-time navigation powered by in-game telemetry, delivering live GPS tracking and turn-by-turn guidance. Its custom routing engine generates accurate and realistic routes using game data, and the navigation is designed to be mod-aware, with explicit support for the Real Company Names mod. apk), and a web app, supporting use on Windows PCs, Android devices, and browsers. The desktop version integrates with Windows, supporting automatic launch on startup, minimized operation in the system tray, and a single-instance lock to prevent multiple windows. The interface supports both portrait and landscape modes, and a localization framework is included, with full German language support and additional languages in development. A recent update resolved UI readability issues for users running the app in Light Mode.
TruckNav is distributed as a complete bundle for PC and Android in a single ZIP file, with both ad-supported and direct download options available. The source code and all releases are hosted on GitHub, and the project is maintained as a solo effort. Users are encouraged to support ongoing development through voluntary donations, but the app itself is always free to use. Setup involves launching the desktop app to obtain an IP address for telemetry, then connecting through the mobile app by entering that IP address. The tool is intended for simulator enthusiasts seeking a more immersive and realistic driving experience in ETS2 and ATS by providing an external, real-time navigation solution.
In the Travel, maps & navigation space, TruckNav v0.4.4 takes a focused approach. It focuses on providing a real-time, external GPS display for enhanced immersion and navigation in truck simulator games. It is built as a consumer product for Euro Truck Simulator and American Truck Simulator players. TruckNav v0.4.4 costs nothing to use. The product ships for the web, Windows, macOS, iOS, and Android.
It is developed by Byatis, and the product first shipped in 2025. Development happens publicly on GitHub with 161 stars and 55 commits in the last 90 days. Key capabilities include Second-screen GPS, desktop interface, and mobile interface.
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