Panasonic has always been an audio-first company. The CN-B200D features a built-in amplifier (typically 50W x 4 peak) and includes a decent equalizer. More importantly for audiophiles, these units often include high-voltage pre-outs (often 4V or higher) for connecting external amplifiers, ensuring that the sound quality remains clean even when the volume is cranked up.
The navigation interface is strictly utilitarian. It offers 2D map views and a bird's-eye view. The routing engine, while slower than modern processors, was incredibly thorough. Panasonic’s algorithms were known for prioritizing "main roads" in Japan, making them highly efficient for highway driving.