Thread: Voice Command support is not available for American English" Problem ?

Connect your device with Webupdater program, proceed to check for additional updates and check if you have the following:

Spoiler: screenshots

So, you will need "Speech Recognition Data, English-Australian ASR" file (***.SRD) and the Australian TTS vioces installed through webupdater.
Then you will need the appropriate (suitable) ***.ASR and ***.SRX files for the map you are using.
You must select one of the two Australian TTS voices on your device.