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66-692: The Sweden Solar System is the world's largest permanent scale model of the Solar System . The Sun is represented by the Avicii Arena in Stockholm , the second-largest hemispherical building in the world. The inner planets can also be found in Stockholm but the outer planets are situated northward in other cities along the Baltic Sea . The system was started by Nils Brenning, professor at

132-434: 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 June 2024, only one confirmed geocacher (on November 17, 2013) has actually found the geocache, although others have claimed to have found it providing varying amounts of evidence. To commemorate

198-464: 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

264-763: 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 another type of location-based game called Munzee . Geocaching

330-445: A 'puzzle cache', players might need to solve a puzzle or bring a special tool to reveal the next waypoint or final coordinates. Most often, the final container is not at the posted coordinates which is noted in the cache description. Some puzzles can be easy and involve basic math operations or they can be quite difficult, with some of the more challenging ones requiring a firm understanding of computer programming . Geocaching Toolbox,

396-518: A GPS-located cache took place on May 3, 2000, by Dave Ulmer in Beavercreek, Oregon . The location was posted on the Usenet newsgroup sci.geo.satellite-nav at 45°17.460′N 122°24.800′W  /  45.291000°N 122.413333°W  / 45.291000; -122.413333 . Within three days, the cache had been found twice, first by Mike Teague. According to Dave Ulmer's message, this cache

462-410: A Reverse cache, a locationless cache is similar to a scavenger hunt . A description is given for something to find, such as a one-room schoolhouse, and the finder locates an example of this object. The finder records the location using their GPS receiver and often takes a picture at the location showing the named object with their GPS receiver. Typically others are not allowed to log that same location as

528-474: 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. Wherigo is a GPS location-aware software platform initially released in January 2008. Authors can develop self-enclosed story files (called "cartridges") that are read by

594-611: 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

660-408: A find. Since 2005, all locationless caches have been archived and locked, meaning they are unable to be logged. However, with geocaching's 20th anniversary in 2020 Groundspeak decided to publish a special locationless cache for geocachers to "find" at various Mega- and Giga-Events around the world. The first locationless cache in 15 years (GC8FR0G) required finders to take a picture of themselves with

726-412: A geocache and a letterbox in the same container. Letterboxes involve a rubber stamp and logbook that are not supposed to be traded and taken instead of tradable items, but letterbox hybrids may or may not include trade items. Letterboxers carry their own stamp with them, to stamp the letterbox's logbook and inversely stamp their personal logbook with the letterbox stamp. The letterbox hybrid cache contains

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792-417: 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

858-408: A geocache. It consists of a container with a log sheet, and is located at the posted coordinates. Cache containers come in many different sizes. These caches are intended to be found at night, usually by use of a UV torch. These caches include at least one stage in addition to the physical final container with a log sheet. The posted coordinates for a multi-cache are the first stage. At each stage,

924-657: 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

990-399: A picture which can be developed and uploaded to a geocaching web site listed below. 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

1056-561: A place that requires people to pay a fee to visit such as airports or theme parks may get the Adventure permanently removed from the Adventure Lab app. There are several kinds of events geocaches. While encouraged, events do not require visitors to sign their name a logbook to prove they attended an event. Attendees of event caches can log that they 'attended', which will increment their number of found caches. Event caches can be of

1122-457: 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 metres, the final coordinates are given to provide a more accurate location for the geocache. This is a combination of

1188-411: A small battery, it is able to transmit a signal detectable on Garmin devices. The Chirp stores hints, multicache coordinates, counts visitors, and can confirm 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

1254-404: 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"

1320-413: 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. As of 2005, new virtual caches are no longer allowed by Groundspeak as it is considered a legacy cache. On August 24, 2017, Groundspeak announced "Virtual Rewards", allowing 4000 new virtual caches to be placed during

1386-532: A walking tour of a city or park. An example would be Route 66 or the Lincoln Highway , which are a nationwide series of Adventure Lab sets of 10 that stretch the entire route across the United States . Adventure labs were first introduced in 2014 as a way to test market ideas through Groundspeak. Initially, geocachers would find a key word at a designated site where they could then enter it onto

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1452-436: A website dedicated to create and solve puzzle geocaches, provides a comprehensive list of common puzzle cache ciphers. There are also some subcategories of the mystery cache, which are normally listed as a Mystery Type, which are listed below. This requires a geocacher to complete a reasonably attainable geocaching-related task before being able to log the cache as a find online. It does not restrict geocachers from finding

1518-513: A website to claim "credit". Soon after, they were made available to "find" at select Mega-Events. In 2020, Groundspeak released the "Adventure Lab" app, separate from the geocaching app. The app made it possible to enter a geo-fence when, once inside, a question will appear that can be answered either in the form of a written answer or a multiple choice answer. This question can be answered at anytime once activated, however, some Adventure Labs must be completed sequentially implying that one must answer

1584-424: 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

1650-495: 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. An RWIG provides three lines of code composed of 9 digits each that

1716-749: Is published not by a local reviewer, but by a volunteer regional reviewer associated with the Geological Society of America . The geocacher usually has to perform a task which teaches an education lesson about the geology of the cache area. Visitors must answer geological questions to complete the cache which can be as simple as describing the color and thickness of layers in an outcrop or can be as complicated as taking measurements of stream velocities or fault offsets. Earthcaches covers geologic topics such as: rock formation , mineralogy , earthquakes , fluvial processes , erosion , volcanology , and planetary science (among others). Otherwise known as

1782-513: Is similar to the game letterboxing (originating 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

1848-425: Is the second most logged geocache in history. The second published locationless cache since 2005 (GC8NEAT) required visitors to take a photo of them picking up trash and cleaning up their local area. geocachers were able to log this cache from 6 February 2021 through 31 December 2022. It has been logged over 33,500 times and holds the title for the most "found" geocache. On 17 August 2022, Geocaching.com made available

1914-575: Is up to the cache owner to designated the cache type for wireless beacon caches. 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 over 20,000 finds as of June 2024. A multi-stage cache hunt that uses

1980-560: Is usually used. The Wherigo site 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

2046-515: 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

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2112-547: The Termination Shock zone). Because of the existence of many small bodies in the real Solar System , the model can always be further increased. The Sun is represented by the Avicii Arena (Globen), Stockholm , which is the second-largest hemispherical building in the world, 110 m (360 ft) in diameter. To respect the scale, the globe represents the Sun including its corona . Solar System model If

2178-414: The "wheelchair accessible" attribute. A bonus cache requires the finder to have found an amount of caches, usually by the same hider, before finding the bonus cache. The cache can be any type, however a bonus cache cannot be required for a second bonus cache. These were found at a listed set of coordinates. The finder hides the cache in a different location, and updates the listing, essentially becoming

2244-583: The 2001 remake of Planet of the Apes . There were 14 APE geocaches placed around the world and each one contained a prop from the film. As of 2023, only 2 APE caches are still active with one near Seattle, Washington ('Tunnel of Light', GC1169) and the other in Brazil ('Southern Bowl', GCC67). Of those two, the Brazil APE cache is the only surviving original APE cache because GC1169 was muggled in 2016. However,

2310-789: The Original Stash Tribute Plaque, now sits at the site. Geocaching company Groundspeak allows extraterrestrial caches, e.g. the Moon or Mars , although presently, the website provides only earthbound coordinates. The first published extraterrestrial 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

2376-648: The Royal Institute of Technology in Stockholm, and Gösta Gahm , professor at the Stockholm University. The model represents the Solar System on the scale of 1:20 000 000, i.e. one metre represents 20,000 km. The bodies represented in this model include the Sun , the planets (and some of their moons ), dwarf planets and many types of small bodies ( comets , asteroids , trans-Neptunians , etc.), as well as some abstract concepts (like

2442-1174: The Solar System. Here is a table comparing these models with the actual system. Belgium An Exploration of Scale National Mall, Washington, D.C. (2001) Kansas City, Missouri (2008) Space Center Houston, Texas (2008) Corpus Christi, Texas (2009) Boulder, Colorado (2021) Palo Alto, California (2022) Broken Arrow, Oklahoma (2022) Ocala, Florida (2022) Calcasieu Parish, Louisiana (2022) Dover, New Hampshire (2023) Spokane, Washington (2022) Memphis, Tennessee (2023) Chalmette, Louisiana (2023) Jonesboro, Arkansas (2023) Troy, New York (2024) Several sets of geocaching caches have been laid out as Solar System models. Solar System   → Local Interstellar Cloud   → Local Bubble   → Gould Belt   → Orion Arm   → Milky Way   → Milky Way subgroup   → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster   → Local Hole   → Observable universe   → Universe Each arrow ( → ) may be read as "within" or "part of". Geocaching Geocaching ( / ˈ dʒ iː oʊ k æ ʃ ɪ ŋ / , JEE -oh- KASH -ing )

2508-515: The Wherigo player software, installed on either a GPS unit or smartphone. The player and story take advantage of the location information provided by the GPS to trigger in-game events, such as using a virtual object or interacting with characters. Completing an adventure can require reaching different locations and solving puzzles. Cartridges are coded in Lua . Lua may be used directly, but a builder application

2574-429: 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

2640-403: 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

2706-425: 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

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2772-546: The cavernous South Station waiting area. The properly-scaled, basket-ball-sized model is 1.3 miles (2.14 km) from the model Sun which is located at the museum, graphically illustrating the immense empty space in the Solar System. The objects in such large models do not move. Traditional orreries often did move, and some used clockworks to display the relative speeds of objects accurately. These can be thought of as being correctly scaled in time , instead of distance . Many towns and institutions have built outdoor scale models of

2838-435: The creation of 1 set of 5 waypoints, with each of the 5 waypoints counting towards a cache find. If selected, Adventure Labs can be created using the Adventure Lab builder. Adventure Labs, unlike all other geocaches, are not subject to review and are published at will by the creator. However, Adventure Labs can at anytime be archived by Groundspeak if they are in violation of terms of use. For example, placing an Adventure Lab in

2904-442: 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

2970-403: The finder. Aside from the logbook, common cache contents are unusual coins or currency , small toys, ornamental buttons, CDs, or books. Although not required, many geocachers decide to leave behind signature items, such as personal geocoins , pins, or craft items, to mark their presence at the cache location. Disposable cameras are popular as they allow for anyone who found the cache to take

3036-419: The following types: GPX files containing information such as a cache description and information about recent visitors to the cache are available from various listing sites. Geocachers may upload geocache data (also known as waypoints ) from various websites in various formats, most commonly in file-type GPX , which uses XML . Some websites allow geocachers to search (build queries) for multiple caches within

3102-452: 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 . Similar to virtual geocaches, an Earth cache

3168-400: The geocacher gathers information that leads them to the next stage or to the final container. 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). Also called

3234-562: The geocaching mascot, Signal the Frog, at Mega- and Giga-Events during 2020. The cache was made available to log starting 1 January 2020. However, because of the COVID-19 pandemic , nearly all planned Mega- and Giga-events were cancelled for the year, including the planned 20th anniversary celebration event in Seattle, Washington . Therefore, Groundspeak decided to extend the deadline to log this geocache through 1 January 2023. With 22,500 finds it

3300-423: 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. 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

3366-455: The important materials for this. Typically, letterbox hybrid caches are not found at the given coordinates which only act as a starting location. Instead, a series of clues are given as to where to find the cache such as "take a left past the bridge" or "about 25 paces past the big oak tree". Also known as Ape caches , these are a special type of traditional cache that were hidden in conjunction with 20th Century Fox and Groundspeak to promote

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3432-444: The logbook and online, but then must return the cache to the same coordinates so that other geocachers may find it. Geocachers are free to take objects (except the logbook, pencil, or stamp) from the cache in exchange for leaving something of similar or higher value. 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

3498-545: 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

3564-478: The original container was later found by a Groundspeak led survey in April of that year. What remains of "Tunnel of Light" is an "official" replacement of the original ammo can that was left in 2001. This cache type does not contain a physical logbook. They are normally hidden at a rather interesting or unique location, usually with a described object such as an art sculpture or a scenic lookout. Validation for finding

3630-432: The question to move on to the next waypoint. Many Adventure Labs caches have a physical bonus cache associated with them that are listed as a "mystery cache". Coordinates to the bonus cache, if applicable, can be seen in the journal entries once a user has correctly answered the question at a waypoint. Geocachers can create their own Adventure Lab, but must first opt-in to receive an "Adventure Lab credit" which allows for

3696-514: 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

3762-545: The same time geocaching started. Geocaches vary in size, difficulty, and location. Simple caches that are placed near a roadside are often called "drive-bys", "park 'n grabs" (PNGs), or "cache and dash". Geocaches may also be complex, involving lengthy searches, significant travel, or use of specialist equipment such as SCUBA diving , kayaking , or abseiling . Different geocaching websites list different variations per their own policies. Container sizes range from nano , particularly magnetic nanos , which can be smaller than

3828-518: 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

3894-402: The smaller planets are to be easily visible to the naked eye, large outdoor spaces are generally necessary, as is some means for highlighting objects that might otherwise not be noticed from a distance. The Boston Museum of Science had placed bronze models of the planets in major public buildings, all on similar stands with interpretive labels. For example, the model of Jupiter was located in

3960-416: The third locationless cache to be logged since 2005 (GC9FAVE). Instead of finding Signal or picking up trash, this cache encouraged geocachers from around the world to share their favorite geocaching story. This geocache was archived and locked on 1 January 2024. A type of virtual cache whose coordinates provide the location to a public webcam . The finder is required to capture an image of themselves through

4026-806: The tip of a finger and have only enough room to store the log sheet, to 20-liter (5 gallon) buckets or even larger containers, such as entire trucks. 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. The simplest form of

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4092-528: 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

4158-490: 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. The finding geocachers record their exploits in

4224-405: The webcam for verification of the find. New webcam caches are no longer allowed by Groundspeak as it is a legacy cache. Webcam caches are a category at Waymarking.com. A type of virtual cache that typically consists of a set of 5 waypoints, with each waypoint counting as a "cache find". The waypoints usually have an overall theme such showcasing the history of a small town and are often created as

4290-411: Was a black plastic bucket that was partially buried and contained various items, such as software, videos, books, money, a can of beans , and a slingshot . The geocache and most of its contents were eventually destroyed by a lawn mower , but the can of beans was the only item salvaged and was later turned into a trackable item known as the "Original Can of Beans". Another geocache and plaque, called

4356-403: 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

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