The best navigation system for the Volkswagen Passat is the Volkswagen RNS 510. This system is highly regarded for its user-friendly interface, comprehensive mapping, and seamless integration with the vehicle's infotainment system. The RNS 510 offers real-time traffic updates, voice control, and Bluetooth connectivity, making it an excellent choice for drivers seeking a reliable and convenient navigation solution.

The Volkswagen RNS 510 stands out due to its advanced features and performance. According to a survey by Car and Driver, the RNS 510 received high marks for its intuitive design and accurate routing. The system's 6.5-inch touchscreen is responsive and easy to navigate, while the included maps cover the United States extensively, ensuring that drivers have access to the most up-to-date information. Additionally, the RNS 510's integration with the Passat's multimedia system allows for seamless control of audio, phone, and navigation functions through the vehicle's steering wheel controls or voice commands.

Furthermore, the RNS 510's real-time traffic updates are powered by the RDS-TMC (Radio Data System-Traffic Message Channel) service, which provides drivers with the latest traffic information to avoid delays and save time. This feature is particularly beneficial for drivers who frequently travel long distances or are navigating through unfamiliar areas.

In terms of reliability, the Volkswagen RNS 510 has a proven track record. Volkswagen has been manufacturing high-quality navigation systems for years, and the RNS 510 is no exception. The system's robust construction and durable components ensure that it can withstand the rigors of daily use, making it a long-lasting investment for Passat owners.

In conclusion, the Volkswagen RNS 510 is the best navigation system for the Passat due to its user-friendly interface, comprehensive mapping, real-time traffic updates, and seamless integration with the vehicle's infotainment system. Its advanced features and reliable performance make it an excellent choice for drivers seeking a top-notch navigation solution.