I don't believe you can do it from either the iPhone or Android Google Maps App....yet. However, you can send a destination from an Android phone running Froyo (Android 2.2) since it supports flash in the internet browser. It isn't the best solution, but it works. On another Navigation note, does anyone know what the on screen orange dotted lines represent in the map? They appear pretty random at times and their location doesn't match a road, path, etc. I've learned that the black/white dashed lines are railroad tracks.