Hi seattlite; The Nav, option on the Hondas will do a variety of voice commands like, Auto-climate-control, sound system, X/M Sat. Radio, as some examples. I have owned Hondas with the Nav. Option and as you have said about the Acura Nav. , Honda is similar in voice commands. I would imagine that there are slight differences in the two with the Acura Line being the Upper-End if you will so Acura probably has some different functions through their voice commands that Honda does not. I have not seen the operators book on the Acura as compared to the Honda so cannot say for sure what the differences are or would be if any. I can tell you that it would take a person with a very-very good memory to be able to remember all the voice commands that are available on the Honda Nav. Vehicles. They do alot through the voice commands.

HTH

Terry