Can anyone recommend any apps where there are saved maps one can use with GPS? i.e., maps that don't need an active internet connection? I took a trip to Australia recently, and between having data roaming off to save money and the fact that a lot of the time I was out of network range, missed having maps. My Garmin GPS+ from 1999 allowed me to pre-save small local maps from a computer and I'm disappointed that the iPhone doesn't have a similar built-in capability. (to clarify, I see many of the wide-area [and expensive] regional maps, I'm looking for something where I can plug in a map of, say, Tampa or the Australian Outback prior to a visit).