All you do ask for directions like you normally would, but tack on "via transit." So, for example, to find the nearest Starbucks, you'd say, "Take me to the nearest Starbucks via transit."
What happens next is that Siri pulls up a list of any installed "routing apps" -- including Google Maps, which, as you probably know, recently returned to the iPhone.From there you tap Route, and presto: you've got directions via Google Maps.
This is perhaps better shown than explained, so check out JailbreakNation's quick video:
Granted, this isn't perfect. There's still that intermediate step of the Routing Apps list and having to tap Route. So it's not a fully voice-powered way to access Google Maps.
On the other hand, there's no jailbreak required,and you get the satisfaction of bypassing Apple's limitations on what Siri can and cannot do.
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