[android-developers] Controlling Navigation Volume

I want to control Navigation Volume of Google Maps from my App. I
suppose the link below is the reference. The question is whe is
Navigation Volume mapped when it gets focus?

Settings.System
http://developer.android.com/reference/android/provider/Settings.System.html

VOLUME_ALARM - Alarm volume.
VOLUME_BLUETOOTH_SCO - Bluetooth Headset volume.
VOLUME_MUSIC - Music/media/gaming volume.
VOLUME_NOTIFICATION - Notification volume.
VOLUME_RING - Ringer volume.
VOLUME_SETTINGS - The mapping of stream type (integer) to its setting.
VOLUME_SYSTEM - System/notifications volume.
VOLUME_VOICE - Voice call volume.

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