I have searched extensively—from Pioneer Japan’s archived support pages to English-language car audio forums.
Why? Because this unit was strictly sold in Japan for the Japanese market. Pioneer’s English documentation only covered their "AVIC" series meant for North America/Europe (e.g., AVIC-F series, AVIC-X series). Pioneer Carrozzeria Avic-rz99 English Manual
The Pioneer Carrozzeria AVIC-RZ99 is a beautiful, well-built unit, but it is not beginner-friendly for English speakers. Buy it for its retro JDM aesthetic and excellent audio processing, but accept that the software will always speak Japanese. Do not expect to use the built-in GPS
Do not expect to use the built-in GPS navigation for street directions outside of Japan. The maps are locked to Japan, and updating them requires a Japanese SD card and a paid subscription to Pioneer’s "Smart Loop" service (discontinued for this generation). Japan Domestic Market (JDM) navi/audio powerhouse
However, there is one massive hurdle for non-Japanese speakers:
If you are reading this, you likely own—or are considering importing—the . This unit is a piece of early 2010s Japanese tech history. As a high-end, Japan Domestic Market (JDM) navi/audio powerhouse, it boasts features that were years ahead of its time: a motorized 7-inch WVGA touchscreen, built-in 3D GPS mapping, DVD/CD playback, SD card slot, USB input, and even built-in digital TV tuners (1Seg/Full Seg).