Yes, you need to adjust the volume WHILE she is talking. you'll see it on the bottom left where the volume level is listed. If you turn the knob while she is giving you turn instructions, it will say "Navigation volume" or something like that instead of the normal "Speaker volume" that you get when you adjust volume while radio is playingJust turn the volume control (on the steering wheel or the knob on the radio) up or down while she is talking. The nav volume will change and that will be the new setting until you turn it up or down again. The stereo volume will not have changed. The radio button/knob regulates navigation volume only while she is talking.