Thanks for all the information. I have now been successful with the RAVPower and file browser. Like geodarts, my Oregon GPS cycles through the internal and external storage, going to one and then the other each time I connect it. I have not found a way, short of taking the internal card out, to have it always go to the internal, but that isn't really much of a problem. I tried the GPSr in both spanner mode and Garmin serial, and it didn't seem to make any difference. So the only other thing I have not been able to do, which may not be possible based on limitations of IGeo knife, is to filter on igeo knife and find a way to export the filtered data base instead of downloading a pocket query from www.geocaching.com. With or without that, I am very thrilled to think about the possibility of traveling with just my IPad, RavPower and GPSr instead of also caring a netbook. When one only carries a backpack, space is really a premium. If there is a different IPad app others think is better I am certainly all ears. I love GSAK on my PC, and know GDAK is available for android, and maybe that would do the filtering and exporting, but at this point, the purchase of another tablet isn't likely.
Thanks again for all you help!