Letterbox Hybridsare based on an older kind of container search, calledletterboxing. Because letterboxing began in 1854, before GPS existed, the finder follows written instructions to discover the container.
Each letterbox contains alogbook,and a rubber stamp. When letterboxers find the container, they stamp the logbook with their personal stamp, and also stamp their own notebook with the stamp from the letterbox as a souvenir of their visit. The stamp and logbook remain in the letterbox for the next visitor to use.
The geocaching version, Letterbox Hybrids, combines theuse of GPS, and the stamps of letterboxing. As with all geocaches, this cache type must include GPS usage. In addition, the cache description can contain written instructions to guide geocachers to the container.
