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Navigation Units refer to the electronic devices specifically designed for use in vehicles to provide drivers with real-time guidance and information on their journeys. They typically feature a built-in GPS system that can pinpoint the user's location, generate maps, and calculate optimal routes based on current traffic conditions. Navigation units often include additional features such as voice recognition, hands-free calling capabilities, and integration with smartphone apps for enhanced functionality. These devices are designed to improve driver safety and convenience by reducing the need for manual map reading or fumbling with mobile devices while driving.