When the NAV voice comes on, the regular volume KNOB becomes the control for the NAV volume. So, quickly turn that knob while the NAV system is talking. As soon as it goes back to music, you can't adjust it for NAV.
This works the same the PHONE. If the PHONE is on a call, you adjust the same knob and that adjusts the volume ONLY for the phone.
Pretty good use of ONE BUTTON for volume on different sytems.
Larry in Los Angeles
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