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Outdoor recreational activity

Geocaching ('/dʒ//iː//oʊ//k//æ//ʃ//ɪ//ŋ/, JEEohKASHing) is an outdoor recreational activity, in which participants use a Global Positioning System (GPS) receiver or mobile device and other navigational techniques to hide and seek containers, called geocaches or caches, at specific locations marked by coordinates all over the world. The first geocache was placed in 2000, and by 2023 there were over 3 million active caches worldwide. Geocaching can be considered a location based game. A typical cache is a small waterproof container containing a logbook and sometimes a pen or pencil. The geocacher signs the log with their established code name/username and dates it, in order to prove that they found the cache. After signing the log, the cache must be placed back exactly where the person found it. Larger containers such as plastic storage containers (Tupperware or similar) or ammo boxes can also contain items for trading, such as toys or trinkets, usually of more sentimental worth than financial. Geocaching shares many aspects with benchmarking, trigpointing, orienteering, treasure hunting, letterboxing, trail blazing, and Munzee.

Geocaching was originally similar to the game letterboxing (which originated in 1854), which uses clues and references to landmarks embedded in stories. Geocaching was conceived shortly after the removal of Selective Availability from the Global Positioning System on May 2, 2000 (Blue Switch Day), because the improved accuracy of the system allowed for a small container to be specifically placed and located. The first documented placement of a GPS located cache took place on May 3, 2000, by Dave Ulmer of Beavercreek, Oregon. The location was posted on the Usenet newsgroup sci. geo. satellite nav at Within three days, the cache had been found twice, first by Mike Teague. According to Dave Ulmer's message, this cache was a black plastic bucket that was partially buried and contained software, videos, books, money, a can of beans, and a slingshot. Another geocache and plaque, called the Original Stash Tribute Plaque, now sits at the site. Geocaching company Groundspeak allows extra terrestrial caches, e. g. the Moon or Mars, although presently, the website provides only earthbound coordinates. The first published extra terrestrial geocache was GC1BE91, which was placed on the International Space Station by Richard Garriott in 2008. It used the Baikonur launch area in Kazakhstan as its position. The original cache contained a travel bug (the first geocaching trackable item in space), which stayed on the station until it was brought back to earth in 2013. Due to fire restrictions on board the station, the geocache contained no official paper logbook. As of February 2021, only one confirmed geocacher (in 2013) has actually found the geocache, although others have claimed to have found it providing varying amounts of evidence. To commemorate the occasion, Groundspeak allowed specialized geocaching events to be published across the world, allowing attendees to obtain a virtual souvenir on their profile. The second geocaching trackable in space is TB5EFXK which is attached to the SHERLOC calibration target on board the Mars Perseverance Rover, which landed on Mars on 18 February 2021. Geocachers were given the opportunity to virtually discover the trackable after the WATSON camera sent back its first photographs of the calibration target that contained the tracking code number. The code is printed on a prototype helmet visor material that will be used to test how well it can withstand the Martian environment. This will help scientists in creating a viable Martian spacesuit for future crewed missions to Mars. The activity was originally referred to as the GPS stash hunt or gpsstashing. This was changed shortly after the original hide when it was suggested in the gpsstash eGroup that "stash" could have negative connotations and the term geocaching was adopted. Over time, a variety of different hide and seek type activities have been created or abandoned, so that "geocaching" may now refer to hiding and seeking containers, or locations or information without containers. An independent accounting of the early history documents several controversial actions taken by Jeremy Irish and Grounded, Inc., a predecessor to Groundspeak, to increase "commercialization and monopolistic control over the hobby". More recently, other similar hobbies such as Munzee have attracted some geocachers by rapidly adopting smart phone technology, which has caused "some resistance from geocaching organizers about placing caches along with Munzees".

For the traditional geocache, a geocacher will place a waterproof container containing a log book, often also a pen and/or pencil and trade items or trackables, then record the cache's coordinates. These coordinates, along with other details of the location, are posted on a listing site (see list of some sites below). Other geocachers obtain the coordinates from that listing site and seek out the cache using their handheld GPS receivers. Typical cache "treasures", also known in the geocaching world as SWAG (a backronym of "stuff we all get"), are not high in monetary value but may hold personal value to the finder. Also common are objects that are moved from cache to cache called "hitchhikers", such as Travel Bugs or geocoins, whose travels may be logged and followed online. Cachers who initially place a Travel Bug or geocoin(s) often assign specific goals for their trackable items. Examples of goals are to be placed in a certain cache a long distance from home, or to travel to a certain country, or to travel faster and farther than other hitchhikers in a race. Less common trends are site specific information pages about the historic significance of the site, types of trees, birds in the area or other such information. Higher value items are occasionally included in geocaches as a reward for the First to Find (called "FTF"), or in locations which are harder to reach. Dangerous or illegal items, including weapons and drugs, are not allowed and are specifically against the rules of most geocache listing sites. Food is also disallowed, even if sealed, as it is considered unhygienic and can attract animals. If a geocache has been vandalized or stolen by a person who is not familiar with geocaching, it is said to have been "muggled". The term plays off the fact that those not familiar with geocaching are called "muggles", a word borrowed from the Harry Potter series of books which were rising in popularity at the same time geocaching started. The most common cache containers in rural areas are lunch box sized plastic storage containers or surplus military ammunition cans. Ammo cans are considered the gold standard of containers because they are very sturdy, waterproof, animal and fire resistant, and relatively cheap, and have plenty of room for trade items. Smaller containers are more common in urban areas because they can be more easily hidden.

Over time many variations of geocaches have developed. Different platforms often have their own rules on which types are allowed or how they are classified. The following cache types are supported by geocaching. com. Traditional geocache The most common type of geocache, consisting of a container with a logbook. Exact coordinates where the cache is located are provided. Multi cache One or more stages, each of which containing the coordinates for the next one; the final stage contains a physical container with the logbook. Multi caches can consist of physical stages (i. e. the first stage contains coordinates for the next stage and so forth) or virtual stages (i. e. the first stage is a historical marker where geocachers have to answer questions to calculate the coordinates to the final physical container). Mystery or puzzle cache This require users to solve a puzzle in order to get the exact coordinates for the geocache. The posted coordinates of mystery caches are usually bogus. It does not restrict geocachers from finding the cache and signing the logbook at anytime. However a geocacher is not allowed to log a find on the geocaching website unless they qualify for the challenge specified in the cache description. Examples include finding a number of caches that meet a category, completing a number of cache finds within a period of time, or finding a cache for every calendar day. Since 2017, Groundspeak has required new challenges to have a geochecker in which users can put their name into an algorithm to see if they qualify without the need of physically checking all of one's previous finds. These geocheckers can be requested using the ProjectGC forums where volunteers can write and create scripts for specific challenges. Groundspeak also has been more strict into what types of challenges are published. For example, prior to 2017 it was possible to create a challenge cache to find 10 caches that have a food item in the title. Under current guidelines, this is no longer allowed because it restricts geocachers to find specific geocaches. Instead, Groundspeak has encouraged new challenges to be more creative. Acceptable challenges include finding caches in 10 states, finding 100 traditional geocaches, or finding 1000 geocaches with the "wheelchair accessible" attribute. Moving or travelling cache These are found at a listed set of coordinates. The finder hides the cache in a different location, and updates the listing, essentially becoming the hider, and the next finder continues the cycle. This cache has been discontinued at geocaching. com and those that have been grandfathered in are solely declining and are being archived. Chirp cache Also known as a wireless beacon cache. This is a Garmin created innovative on multi caches using wireless beacon technology. It is a physical game piece, about the size of a half dollar that can be hidden anywhere. Powered by a small battery, it is able to transmit a signal detectable on Garmin devices. The Chirp stores hints, multicache coordinates, counts visitors, and can confirms the cache is nearby. These caches caused considerable discussion and some controversy at Groundspeak, where they were ultimately given a new "attribute". These types of geocaches can also be listed as a traditional, multi cache, or letterbox. It is up to the cache owner to designated the cache type for wireless beacon caches. Night cache These are multi stage and intended to be found at night by following a series of reflectors with a flashlight to the final cache location. Considered a variant of the Mystery cache on geocaching. com. Geocaching HQ Geocache (GCK25B) This is an official geocache located inside the Groundspeak headquarters office in Seattle, Washington. It is technically classified as a separate cache type under mystery caches, with its own unique icon both on the geocaching app and on one's profile statistics tab. Since publication in 2004, it has nearly 20,000 finds as of August 2023. Wherigo cache A multi stage cache hunt that uses a Wherigo "cartridge" to guide players to find a physical cache sometime during cartridge play, usually at the end. However, not all Wherigo cartridges incorporate geocaches into gameplay. Wherigo caches are unique to the geocaching. com website. offers a builder application and a database of adventures free for download, though the builder has remained in its Alpha version since its last release in May 2008. The official player is only available for Pocket PC. A built in player is available on Garmin Colorado and Oregon GPS models. The Wherigo Foundation was organized in December 2012. The group is composed of all Wherigo application developers who, up until that time, had been acting and developing separately. Their goal is to provide a consistent Wherigo experience across platforms, connect Wherigo applications via an API, and add modern features to the Wherigo platform. While Groundspeak is aware of this project, the company has yet to take a position. Reverse Wherigo An RWIG provides three lines of code composed of 9 digits each that a player can type into the RWIG cartridge. Instead of following a story or interacting with characters, and RWIG gives you the distance to the final cache, but not direction. It requires geocachers to get closer to the final geocache by process of elimination. Once you are within 25 yards, the final coordinates are given to provide a more accurate location for the geocache. Letterbox cache (Also known as a letterbox hybrid cache) This is a combination of a geocache and a letterbox in the same container. A letterbox has a rubber stamp and a logbook instead of tradable items. Letterboxers carry their own stamp with them, to stamp the letterbox's log book and inversely stamp their personal log book with the letterbox stamp. The hybrid cache contains the important materials for this and may or may not include trade items. Virtual cache Coordinates for a rather interesting or unique location, usually with a described object such as an art sculpture or a scenic lookout. Validation for finding a virtual cache generally requires one to email the cache hider with information such as a date or a name on a plaque, or to post a picture of oneself at the site with a GPS receiver in hand. On August 24, 2017, Groundspeak announced "Virtual Rewards", allowing 4000 new virtual caches to be placed during the following year. Each year, eligible geocachers can opt in to a drawing and some selected with the opportunity to submit a virtual cache for publication. From 2005 to 2017, the geocaching website no longer listed new caches without a physical container, including virtual and webcam caches (with the exception of earthcaches and events); however, older caches of these types have been grandfathered in (except for locationless or reverse, which are completely archived and transferred to Waymarking. com). EarthCache A type of virtual geocache that is published not by a local reviewer, but by a volunteer regional reviewer associated with the Geological Society of America. The cacher usually has to perform a task which teaches an education lesson about the geology of the cache area. Some websites allow geocachers to search (build queries) for multiple caches within a geographic area based on criteria such as ZIP code or coordinates, downloading the results as an email attachment on a schedule. In recent years, Android and iPhone users can download apps such as GeoBeagle that allow them to use their 3G and GPS enabled devices to actively search for and download new caches.

A variety of geocaching applications are available for geocache data management, file type translation, and personalization. Geocaching software can assign special icons or search (filter) for caches based on certain criteria (e. g. distance from an assigned point, difficulty, date last found). Paperless geocaching means hunting a geocache without a physical printout of the cache description. Traditionally, this means that the seeker has an electronic means of viewing the cache information in the field, such as pre downloading the information to a PDA or other electronic device. Various applications can directly upload and read GPX files without further conversion. Newer GPS devices released by Garmin, DeLorme, and Magellan have the ability to read GPX files directly, thus eliminating the need for a PDA. Other methods include viewing real time information on a portable computer with internet access or with an Internet enabled smart phone. The latest advancement of this practice involves installing dedicated applications on a smart phone with a built in GPS receiver. Seekers can search for and download caches in their immediate vicinity directly to the application and use the on board GPS receiver to find the cache. A more controversial version of paperless caching involves mass downloading only the coordinates and cache names (or waypoint IDs) for hundreds of caches into older receivers. This is a common practice of some cachers and has been used successfully for years. In many cases, however, the cache description and hint are never read by the seeker before hunting the cache. This means they are unaware of potential restrictions such as limited hunt times, park open/close times, off limit areas, and suggested parking locations.

The website geocaching. com now sells mobile applications which allow users to view caches through a variety of different devices. Currently, the Android, iOS, and Windows Phone mobile platforms have applications in their respective stores. The apps also allow for a trial version with limited functionality. The site promotes mobile applications, and lists over two dozen applications (both mobile and browser/desktop based) that are using their proprietary but royalty free public application programming interface (API). Developers at c:geo have criticised Groundspeak for being incompatible with open source development. Additionally, "c:geo opensource" is a free opensource full function application for Android phones that is very popular. This app includes similar features to the official Geocaching mobile application, such as: View caches on a live map (Google Maps or OpenStreetMap), navigation using a compass, map, or other applications, logging finds online and offline, etc. Geocaching enthusiasts have also made their own hand held GPS devices using a Lego Mindstorms NXT GPS sensor.

Geocache listing websites have their own guidelines for acceptable geocache publications. Government agencies and others responsible for public use of land often publish guidelines for geocaching, and a "Geocacher's Creed" posted on the Internet asks participants to "avoid causing disruptions or public alarm". Generally accepted rules are to not endanger others, to minimize the impact on nature, to respect private property, and to avoid public alarm.

The reception from authorities and the general public outside geocache participants has been mixed. Cachers have been approached by police and questioned when they were seen as acting suspiciously. Other times, investigation of a cache location after suspicious activity was reported has resulted in police and bomb squad discovery of the geocache, such as the evacuation of a busy street in Wetherby, Yorkshire, England in 2011,

Schools have been evacuated when a cache has been seen by teachers or police, such as the case of Fairview High School in Boulder, Colorado in 2009. A number of caches have been destroyed by bomb squads. Diverse locations, from rural cemeteries to Disneyland, have been locked down as a result of such scares. The placement of geocaches has occasional critics among some government personnel and the public at large, who consider it littering. Some geocachers act to mitigate this perception by picking up litter while they search for geocaches, a practice referred to in the community as "Cache In Trash Out". Caches might also be hidden in places where the act of searching can make a finder look suspicious (e. g., near schools, children's playgrounds, banks, courthouses, or in residential neighborhoods), or where the container placement could be mistaken for a drug stash or a bomb (especially in urban settings, under bridges, near banks, courthouses, or embassies). As a result, geocachers are strongly advised to label their geocaches when possible, so that they are not mistaken for a harmful object if discovered by non geocachers. As well as concerns about littering and bomb threats, some geocachers have hidden their caches in inappropriate locations, such as electrical boxes, which may encourage risky behavior, especially by children. Hides in these areas are discouraged,

The South Carolina House of Representatives passed Bill 3777 in 2005, stating, "It is unlawful for a person to engage in the activity of geocaching or letterboxing in a cemetery or in a historic or archaeological site or property publicly identified by a historical marker without the express written consent of the owner or entity which oversees that cemetery site or property." The bill was referred to committee on first reading in the Senate and has been there ever since. The Illinois Department of Natural Resources requires geocachers who wish to place a geocache at any Illinois state park to submit the location on a USGS 7.5 minute topographical map, the name and contact information of the person(s) wishing to place the geocache, a list of the original items to be included in the geocache, and a picture of the container that is to be placed. In April 2020, during the COVID 19 pandemic, the township of Highlands East, Ontario, Canada temporarily banned geocaching, over concerns that geocache containers cannot be properly disinfected between finds.

Several deaths have occurred during the course of caching. The death of a 21 year old experienced cacher in December 2011 "while attempting a Groundspeak cache that does not look all that dangerous" led to discussions of whether changes should be made, and whether cache owners or Groundspeak could be held liable. Groundspeak has since updated their geocaching. com terms of use agreement to specify that geocachers find geocaches at their own risk. In 2008, two lost hikers on Mount Hood in Oregon, U. S. stumbled across a geocache and phoned this information out to rescuers, allowing crews to locate and rescue them. Three adult geocachers, a 24 year old woman and her parents, were trapped in a cave and rescued by firefighters in Rochester, New York, U. S. while searching for a geocache in 2012. Rochester Fire Department spokesman Lt. Ted Kuppinger said, "It's difficult, because you're invested in it, you want to find something like that, so people will probably try to push themselves more than they should, but you need to be prudent about what you're capable of doing." In 2015, members of the public called the British coastguard to check on a group of geocachers who were spotted walking into the Severn Estuary off the coast of Clevedon, England, in search of clues to locate a multi cache. Although they felt they were safe and able to return to land, they were considered to be in danger and were airlifted back to the shore. In October 2016, four people discovered a crashed car at the bottom of a ravine in Benton County, Washington, U. S., while out geocaching. They spotted the driver still trapped inside and alerted emergency services, who rescued the driver. On 9 June 2018, four people in Prague, Czech Republic were searching for a cache in a 4 km long tunnel when a storm surge carried them through the tunnel to its terminus at the Vltava river. Two of the geocachers died, while two others were rescued from the river.

Numerous websites list geocaches around the world. Geocaching websites vary in many ways, including control of data.

The first website to list geocaches was announced by Mike Teague on May 8, 2000. On September 2, 2000, Jeremy Irish emailed the gpsstash mailing list that he had registered the domain name geocaching. com and had set up his own Web site. He copied the caches from Mike Teague's database into his own. On September 6, Mike Teague announced that Jeremy Irish was taking over cache listings. as of 2012, Teague had logged only 5 caches.

The largest site is Geocaching. com, owned by Groundspeak Inc., which began operating in late 2000. With a worldwide membership and a freemium business model, the website claims millions of caches and members in over 200 countries. Hides and events are reviewed by volunteer regional cache reviewers before publication. Free membership allows users access to coordinates, descriptions, and logs for some caches; for a subscription fee, users are allowed additional search tools, the ability to download large amounts of cache information onto their gps at once, instant email notifications about new caches, and access to premium member only caches. Geocaching Headquarters are located in the Fremont neighborhood of Seattle, Washington, United States.

The Opencaching Network provides independent, non commercial listing sites based in the cacher's country or region. The Opencaching Network lists the most types of caches, including traditional, virtual, moving, multi, quiz, webcam, BIT, guest book, USB, event, and MP3. The Opencaching Network is less restrictive than many sites, and does not charge for the use of the sites, the service being community driven. Some (or all) listings may or may not be required to be reviewed by community volunteers before being published and although cross listing is permitted, it is discouraged. Some listings are listed on other sites, but there are many that are unique to the Opencaching Network. Features include the ability to organize one's favourite caches, build custom searches, be instantly notified of new caches in one's area, seek and create caches of all types, export GPX queries, statpics, etc. Each Opencaching Node provides the same API for free (called "OKAPI") for use by developers who want to create third party applications which can use the Opencaching Network's content. Countries with associated opencaching websites include the United States at www. opencaching. us; Germany at www. opencaching. de; Sweden at www. opencaching. se; Poland at www. opencaching. pl; Czech Republic at www. opencaching. cz; The Netherlands at www. opencaching. nl; Romania at www. opencaching. ro; the United Kingdom at www. opencache. uk. The main difference between opencaching and traditional listing sites is that all services are open to the users at no cost. Generally, most geocaching services or websites offer some basic information for free, but users may have to pay for premium membership that allows access to more information or advanced searching capabilities. This is not the case with opencaching; every geocache is listed and accessible to everyone for free.

In many countries there are regional geocaching sites, but these mostly only compile lists of caches in the area from the three main sites. Many of them also accept unique listings of caches for their site; these listings tend to be less popular than the international sites, although occasionally the regional sites may have more caches than the international sites. There are some exceptions, such as how, in the territory of the former Soviet Union, the site Geocaching. su remains popular because it accepts listings in the Cyrillic script. Additional international sites include Geocaching. de, a German website, and Geocaching Australia, which accepts listings of cache types deprecated by geocaching. com, cache types such as TrigPoint and Moveable caches, as well as traditional geocache types.

GPSgames. org was an online community dedicated to all kinds of games involving Global Positioning System receivers. GPSgames. org allowed traditional geocaches as well as virtual, locationless, and traveler geocaches. The site's geodashing game generated a large number of randomly positioned "dashpoints", requiring players to reach as many as possible, competing as individuals or teams. Shutterspot, GeoVexilla, MinuteWar, GeoPoker, and GeoGolf were among the other GPS games available. GPSgames. org was 100% free since 2001, through donations. The site was retired on 30 June 2021.

Navicache. com started as a regional listing service in 2001. While many of the website's listings have been posted to other sites, it also offers unique listings. The website lists nearly any type of geocache and does not charge to access any of the caches listed in its database. All submissions are reviewed and approved. In 2012 it was announced that Navicache was under transition to new owners, who said they "plan to develop a site that geocachers want, with rules that geocachers think are suitable. Geocaching. com and OX are both backed by large enterprises, and while that means they have more funding and people, we're a much smaller team – so our advantage is the ability to be dynamic and listen to the users."

Terracaching. com aims to provide high quality caches made so by the difficulty of the hide or from the quality of the location. Membership is managed through a sponsorship system, and each cache is under continual peer review from other members. Terracaching. com embraces virtual caches alongside traditional or multi stage caches and includes many locationless caches among the thousands of caches in its database. It is increasingly attracting members who like the point system. In Europe, TerraCaching is supported by Terracaching. eu. This site is translated in different European languages, has an extended FAQ and extra supporting tools for TerraCaching. TerraCaching strongly discourages caches that are listed on other sites (so called double listing).

Extremcaching is a German private database for alternative geocaches with a focus on T5 / climbing caches, night caches, and lost place caches.

Geocaching Australia is a community website for geocachers in Australia and New Zealand. Geocaching Australia also has many unique cache types such as Burke And Wills, Moveable cache & Podcache geocaches.