RoundTrip wrote:ways and W.A.Z.E both fail for me.
"was" seems to work, it is also how siri pronounces the app. If you say "launch was GPS" or "launch GPS was" you should get WAZE or a list of your installed GPS apps..
It may also depend a little on which region you have your language set to.
Siri understands when I spell Waze.
It is also working when I pronounce it Wozz. (short o).