According to section 5 of Groundspeak's terms of use, "You agree that you will not use any robot, spider, scraper or other automated means to access the Site for any purpose without our express written permission."
The c:geo app scrapes the geocaching.com site.
According to info posted on the feedback site, Groundspeak is working on a public API. Once a public API is released, if the author of c:geo stops scraping the geocaching.com site and switches to the public API, then you can use c:geo without violating the TOU.
The app is called "Geocaching" and I can find it pretty easily on the Android market.
No. There are other third-party apps that respect the TOU. Before I switched to the Groundspeak app, I used GeoBeagle, which works both for spur-of-the-moment geocaching (with a data connection) or for geocaching with PQ data (with or without a data connection). GeoBeagle respects Groundspeak's TOU, and is free (both like beer and like speech).
Im sorry, I mistated what I meant to say, when I said that geocaching does not have a mobile version of the site....what I meant was there is not a FREE app to use, it cost 9.99 and C-Geo is FREE