In geocaching, a cache is a container hidden by a participant that geocachers must find using their GPS device. There are several types of caches. The traditional cache is the most common. Here is a description of the different types.
Cache Types
Traditional Cache
This is the original type of cache, consisting, in its simplest form, of a container and a logbook. The cache may contain tradeable items. Typically, you’ll find a Tupperware container, an ammo can, a bucket filled with trinkets, or a smaller container ("micro-cache") too small to hold items other than a logbook. The coordinates listed on the traditional cache’s page are the exact location of the cache. A container with only a single item or a verification code and no logbook is generally not considered a traditional cache.
Multi-Cache
There are many variations of multi-stage caches. The most common involves the first cache or waypoint providing coordinates for the next location. Another popular variant consists of a series of waypoints, each providing partial coordinates for the final cache location.
Another variation of multi-caches does not require simply going to given coordinates and finding a cache there. Instead, the listed coordinates may lead to a historical monument, plaque, or other notable landmark. At that location, the geocacher looks for numbers or information on the landmark (geocachers never damage public or private property). This information is then used, following instructions on the cache page, to continue the hunt. (On geocaching.com, these are classified as "multi-caches.")
Multi-caches can typically be solved entirely on-site, without the need for external research (such as online).
Mystery or Puzzle Cache
The "catch-all" category for caches, this type often involves solving complex puzzles to determine the coordinates. All necessary information to solve the puzzle must be available to the geocaching community, and the cache must be findable using the information provided. For example, a puzzle requiring public website research may be acceptable, but a puzzle requiring you to email the owner for the coordinates is not. The provided coordinates are not for the actual cache location but rather a general reference point, like a nearby parking lot. Unless there is a good reason, the provided coordinates should not be more than 1.5 to 3 km from the true location to ensure proximity searches and mileage tracking remain accurate.
If you choose to submit this type of cache, please provide as much detailed information as possible to the reviewer when submitting. The reviewer may still request additional information before approval. Please cooperate with their requests.
Letterbox Hybrid
Letterboxing is another form of treasure hunt that uses clues to guide seekers to a hidden container. Each letterbox contains a stamp as its signature. Most geocachers have their personal stamp and logbook. They stamp the letterbox log with their own stamp and use the box’s stamp for their personal logbook.
Letterbox hybrids combine elements of letterboxing and geocaching. They should contain a signature stamp that remains in the box and must comply with traditional cache guidelines by including a logbook. They must be findable using latitude and longitude, not just clues. Letterbox hybrids may or may not contain trade items, depending on the owner. Typically, personal stamps and logbooks aren’t required for letterbox hybrids.
Event Cache
Event caches are gatherings organized by geocachers for geocachers and open to all. After the event, the event cache must be archived by the organizer within four weeks. While concerts, garage sales, amateur radio field days, or fireworks might interest many geocachers, such events are not eligible as event caches unless geocachers are the primary organizers and participants. Additionally, an event cache should not exist solely to gather geocachers for an organized hunt of one or more caches. Such group hunts are better arranged via forums or mailing lists.
For events with multiple activities, like a full day of group caching that includes a meeting and dinner, a single event cache covering all elements should be submitted.
Event caches must be submitted at least two weeks prior to the event date to allow potential participants to plan. Events are typically not approved more than three months in advance to avoid cluttering listings. Exceptions may be made for large regional, national, or international events, which may be approved up to six months in advance. Contact your reviewer if you wish to host such an event.
CITO Event Cache
The "Cache In Trash Out" (CITO) concept was introduced in fall 2000 to allow geocachers to contribute to keeping parks and public lands clean. You can learn more about CITO at http://www.cacheintrashout.org.
The CITO event category differentiates clean-up events from other event caches. Use this category when asking geocachers to gather on a specific day to clean up a park, remove trash from a shoreline, etc. Do not use this category for a physical cache placed in an area needing cleanup; simply mention the opportunity on your cache page.
CITO events are organized and sponsored by geocachers, not outside organizations. If you believe your event meets the spirit of this unique category but are unsure, please get permission before submitting.
Mega-Event Cache
A mega-event cache is just like an event cache but on a larger scale. To qualify as a mega-event, the event must expect 500 or more participants. Mega-events are usually annual and draw geocachers from around the world.
EarthCache
An EarthCache is a special place where people can learn about a unique aspect of the Earth. EarthCaches include educational notes and details about the location (latitude and longitude). Visitors learn how geological processes have shaped our planet, how resources are managed, and how scientists gather evidence about the Earth. For more information about EarthCaches, visit http://www.earthcache.org/.
Former Cache Types
These are cache types no longer available for creation on geocaching.com. Visit http://www.waymarking.com for other GPS-related activities.
Virtual Cache
A virtual cache is a cache that exists as a location rather than a container. Depending on the owner, a virtual cache may involve answering a question about a place, an interesting landmark, or a task. The reward is the visit itself and sharing your experience.
Since virtual caches don’t have a physical container, you must visit the site to gather the information needed to log your find. Only locations that are truly extraordinary qualify as virtual caches.
Virtual caches have been integrated into http://www.waymarking.com.
Webcam Cache
Webcam caches use existing webcams placed by individuals or organizations monitoring locations like parks or traffic conditions. The idea is to stand in front of the camera and capture an image to log your find. The challenge often involves calling a friend to save the webcam image or using wireless technology to save the image yourself.
Webcam caches have been integrated into http://www.waymarking.com under the webcams category.
Locationless (Reverse) Cache
Locationless caches are essentially the opposite of traditional caches. Instead of finding a hidden container, your mission is to locate a specific object and record its coordinates. In other words, you’re collecting coordinates of various objects worldwide.
Locationless (reverse) caches have been moved to http://www.waymarking.com.
Physical Cache Sizes
- Micro: 35mm film canister or smaller, containing only a logbook.
- Small: Sandwich-sized Tupperware or similar, holding small trade items and a logbook.
- Regular: Standard Tupperware container or ammo can.
- Large: 5-gallon bucket or larger.
