See also:

Customer Assistance for Text Telephone (TTY) Users (U.S. and Canada)
To assist customers who are deaf, hard of hearing, or speech impaired and who use Text Telephones (TTYs), GMC has TTY equipment available at its Customer Assistance Center. Any TTY user can communicat ...

Root Directory
The root directory of the disc is treated as a folder. If the root directory has compressed audio files, the directory displays as F1 ROOT on the radio. If a disc contains both uncompressed CD audio ...

Playing from a USB
A USB mass storage device or Microsoft Transfer Protocal (MTP) device can be connected to the USB port. The USB port is in the center console. The USB icon displays when the USB device is connecte ...