String uri = "geo:"+ latitude + "," + longitude;
startActivity(new Intent(android.content.Intent.ACTION_VIEW, Uri.parse(uri)));
или с адресом:
geo:latitude,longitude
geo:latitude,longitude?z=zoom
geo:0,0?q=my+street+address
geo:0,0?q=business+near+city
http://developer.android.com/guide/appendix/g-app-intents.html
Например:
Uri uri = Uri.parse("geo:38.899533,-77.036476");
Intent it = new Intent(Intent.Action_VIEW,uri);
startActivity(it);
Для навигации:
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("google.navigation:q=" + location));
startActivity(i);