an object (usually a box containing a small item and a record of the people who have found it) that is hidden somewhere outdoors and that people look for using GPS (= a system that uses signals from satellites to show somebody/something’s position on earth) in the activity of geocaching Within 30 minutes of walking we arrived at the spot where our first geocache was located. 在步行的30分钟内，我们到达了第一个地理缓存所在的地点。