See also:

Notes On Playing MP3 Files
The radio can play MP3 files; however, acceptable MP3 file recording media and formats are limited. When writing MP3 files, pay attention to the following restrictions. ...

Operating Instructions — Radio Mode
NOTE: The ignition switch must be in the ON/RUN or ACC position to operate the radio. Power Switch/Volume Control (Rotary) Push the ON/VOLUME control knob to turn on the radio. Push the ON/VOLUM ...

To Resume Speed
To resume a previously set speed, push the RES (+) button and release. Resume can be used at any speed above 20 mph (32 km/h). ...