Pocket Queries are custom geocache queries you can have emailed to you on a daily or weekly basis. If you are interested in hunting only specific types of geocaches with specific attributes, this is how you can search for them. For example: You are only interested in traditional caches that are dog-friendly, with an easy terrain and difficulty.
A Pocket Query makes it easy to search by cache type, size, difficulty, location conditions and more.
http://www.geocaching.com/pocket/
They are in a format you can bring along with you on cache hunts on your GPS and/or PDA. You can select a GPX or LOC text file that works with supported software applications. Because of the detailed queries, each search can run only once per day. You have up to 5 pocket queries run every 24 hour period.
Using this service you agree to the terms of this license agreement:
http://www.geocaching.com/waypoints/agreement.aspx
Only Premium Members have access to Pocket Queries. To become a Premium Member, please visit the Member Features section of My Account page. Here is a shortcut:
https://www.geocaching.com/membership/premium.aspx