My Navi rarely gets my voice recognition correct for street names, so in frustration, I said "spell" and lo and behold I was able to enter letters. I still can't faithfully force Navi to solicit my spelling, but I'm making progress. "Spell" is a command. I learned this by accident.
Yesterday, someone mentioned "Atlas on" to get the map to move.
How many other useful, not-publicized, commands are there? Where is the secret list kept?