Sat Nav Volume Merc C Class

[smurfchops]

When I have the radio on, the sat nav voice is louder than the radio. Suddenly The sat nav voice is silent and when I switch it up the radio turns up instead. I would like to have the radio on all the time with a loud sat nav voice on top of the music. Can anyone help? The manual doesn't seem to have anything to turn up volume on sat nav.

[bhg481]

On my Volvo the radio volume knob also controls the sat-nav volume. If you adjust the volume WHILST THE SAT-NAV IS SPEAKING the sat-nav volume is altered - the radio volume will remain where it was. If you adjust the volume whilst the radio is playing (and the sat-nav is silent) the sat-nav volume is unaffected. Maybe the same is true on your Merc.