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help navigation mute / lock icon

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The NAV volume can be adjusted at least two ways: 1. When navigating, tap “show directions”. Then tap the little speaker looking icon. 2. Adjust the scroll wheel volume control while NAV is speaking.

The lock icon in the upper left of the screen, controls the door locks. Nothing to do with Navigation.

AFAIK, there has been no change with either of these functions, for a very long time. Both are covered thoroughly in the manual.