Pocket queries
From GeoWiki
Geocaching.com Premium members have the ability to create Pocket Queries. A Pocket Query allows you to have a list of caches from a customized search, generate a GPX waypoint file and/or eBook.
File Types
What formats does Groundspeak provide this data in?
* The first is a LOC file (a file with the extension LOC on the end). This is currently the default file type that Geocaching.com uses when exporting information from the website into a format that can be directly loaded to your GPS. All you need is some software that can read LOC files and a cable from your computer to your GPS.
* The second is a GPX file. This is similar to a LOC file, but the file contains much more information, including some information about the logs on the cache, whether or not there's a travel bug, etc. GPX files can also be run with the most current versions of EasyGPS or ExpertGPS, but there's also an abundance of new software being written by cachers to interpret these files. GSAK is the ideal software for the job.
* The third format is a eBook Format file. This is particularly useful for those cachers that have Palm Pilots or other hand-held computers. It contains the information about the cache that you normally find on the cache page, including logs and encrypted clues for the caches that meet your specified criteria. The idea is to carry your Palm device into the field and save yourself from printing off cache pages to take with you.