The volume knob on the radio controls volume for everything. When the radio is on turning it up and down turns the radio volume up and down. If you catch it while nav is giving you directions and turn the knob at that instant the volume for the nav is adjusted. During a call or before you answer the incoming call maybe is when you would need to adjust that volume so the knob is thinking the same thing you are and you are not just turning down the radio or turn by turn.
'06 HEMI LIMITED LOADED QDII DE-BADGED, TINT, SILVERSTAR ULTRAS, LED TAILS, R/C LIFT, BILSTEINS, KMC XD HOSS WHEELS, DURATRACS, MAGNAFLOW, K&N CAI and OIL FILTER, ROYAL PURPLE, HAWK HPS PADS, RED CALIPERS, LEDs BEHIND GRILLE
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