FAQ
Welcome to our FAQ where we collect and answer frequently asked questions. To quickly find an answer to your question, use the Find in page feature of your browser - usually accessible by pressing Ctrl+F.
If you still don't find the answer you're looking for, check out our User Guide.
These issues are caused by several website changes on geocaching.com. Please update to release 2024.04.18 which fixes all bugs known until then. As there are ongoing website changes, new bugs may arise. We have created a status overview page for those issues.
On the very first startup after a version upgrade of the app c:geo might not be able to detect your premium membership.
We are workin on that problem. As a workaround please force close c:geo (or restart your device) to enforce a new login by c:geo. Afterwards your membership status should be shown correctly and all premium functions should be available again.
This is most likeley a permissions problem. Specifically some Samsung mobiles seem to be affected, sometimes also other vendors. To gain access to map and map theme files stored in their configured folders, c:geo calls a system app called “external storage”. This app needs to have access to those files to be able to provide them to c:geo. Please check, if the following setting is enabled: Samsung devices: Settings → Apps → Special Access (from “Three dots menu”) → All files access → External Storage Other vendors: (should be similar, but we don’t know the exact navigation yet)
The new feature performs batch refresh/download of caches in the background instead of blocking the usage of c:geo during download. This implies, that you probably need to allow c:geo be active while in background. Otherwise cache downloads might fail as soon as your device goes into sleep or you use another app.
On most devices you will find energy saving preferences in your device settings fur this purpose. Make sure to allow background activity for c:geo there. On recent Samsung devices you will e.g. find it in Settings → Apps → c:geo → Battery, where you should set it to “Unrestricted”.
If you are using a device running Android 12 you might experience, that c:geo is not offered as target app (anymore) when tapping a geocaching related link e.g. from your email. Instead the link is opened in another app or your browser without giving you a choice.
This is caused by the fact, that in Android 12 Google removed the dialog to let the user choose which app to use for certain web links. Instead the browser or an app which officially registered for that specific weblink is automatically used.
You can change this by going to your device app settings, open the c:geo app settings and manually select what URLs (web links) you allow c:geo to open. Unfortunately in Android 12 you can only set this as permanently (no longer asking each time you tap such link).
Info for Xiaomi users: On some Xiaomi devices this procedure does not work as Xiaomi did not follow common Android practice and does not offer the mentioned setting. In this case you might want to look into this helper app which acts as an app chooser for those cases.
If you experience, that this setting is removed by your device automatically, than you probably also have the Groundspeak Geocaching app installed on your device. As the Groundspeak app registered itself as owner of the website, this will overrule your personal setting. Luckily there is an easy workaround: Go to your device app settings, open the setting for the Groundspeak app and completely disable the function, that it is opened for supported weblinks. Afterwards activate it for c:geo as described above.
Some of cgeo’s users reported the following steps as working on Xiaomi and Poco mobiles:
- Install and open app “Hidden Settings for Miui” (It’s in the PlayStore)
- Select Settings –> Manage Aplications
- If official geocaching app is installed, choose it –> select “Open by definition” –> “Add Link” —> remove all selected –> Back and then disable “Open compatible Links”.
- Choose c:geo –> Enable “Open compatible Links” –> Select all the links.
- For Poco devices tap on “Open by default” in app settings, then “open supported links”, then check the links you want to have opened in c:geo
You can find information about how to get started with c:geo in our user guide.
c:geo is only using the login details you specified on the geocaching website.
You must go to the geocaching website to reset your password. After you successfully restored your password there, please go to c:geo settings and enter the new login data.
For example on geocaching.com you can reset your password on this page. If you forgot your username you can request it on this page.
Please check this page of user guide, which provides detailed help in case of login problems.
Attention:
This procedure will delete all stored caches and app settings!
- If needed, perform a backup of your caches in Menu → Settings → Backup/Restore
- Go to your Android settings (not c:geo settings) and select Apps or Appmanager → c:geo → “Delete data”
- On the next start of c:geo it will be back to factory settings and take you directly to the login screen.
- Enter your login data for the desired geocaching website
- Restore your backup (You will be asked for restoring once you enter the main screen of c:geo)
Starting with 2020.09.02-RC c:geo does now support an offline find count. This means, that your find count will be incremented also for offline logs. This way you can use the signature template [NUMBER] also for offline logs.
To remind you of existing offline logs those are shown separate to your online find count. If this offline number shows up unexpected, you might have some offline logs from the past still stored in c:geo. Open the list “History” and filter “Status” - “Has Offline Log=YES” to see the caches causing this.
If you do no longer need these offline logs you can clear them by selecting Menu → Manage caches → Clear offline logs while on the history list.
c:geo uses metric units by default but should detect automatically if your phones default is set to imperial units.
You can also manually select your preference in c:geo settings:
c:geo Menu → Settings → Appearance → “Use Imperial units”
In order to minimize the network traffic c:geo downloads caches only once and stores them temporary or permanently (if you save them on your list).
So if you miss some information (e.g. newest logs are missing, description has changed, etc.) please refresh the stored cache by selecting the “Refresh” button on the cache detail page.
The initial idea of c:geo is to provide a free (and open-source) app for mobile geocaching for everybody.
What would change with the API?
- c:geo only for premium members
- No support for Opencaching or other platforms than geocaching.com
- Groundspeak advertisements
There would also be problems with the development:
- The API requires a private key for the app. But c:geo is open source. There are a lot of independent developers, but only one would get the key. All other developers would not be able to test what they do.
- c:geo would no longer be open source
- Only a few core developers would be allowed
- Much slower development would result from that
While Groundspeak’s API would fix some of our current problems, c:geo would then force users to pay money to a corporation. This is not the open-source spirit. If Groundspeak says OK to our ideas then c:geo might have use the API someday…
Yes, this is possible. Tap on your log, a context menu will appear. Select “Edit log”.
There are two main things we are storing on your device:
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The geocache database containing basically the content of your lists:
You may store the database of c:geo either system internally or in a directory on your user storage.
You can change the database location in Menu → Settings → Offline Data → “Database location”.
As the database availability is critical for using c:geo and the typical size is only some megabyte, we decided to forbid moving it to the external SD card. If you enable the option “On user storage” the database will be moved to the folder /Android/data/cgeo.geocaching/files/databases (may vary depending on your device). -
The additional data (e.g. images, maps) for all the caches stored in the database:
This additional data can be much larger as it contains the images of the cache description and (optionally) and the images retrieved from logs.
By default this data is stored on the internal user storage in /Android/data/cgeo.geocaching/files/GeocacheData/.You can move this data to your external SD card in Menu → Settings → Offline Data → “Geocache Data Directory”.
If your device supports using the external SD card this menu option will show you the available target directories as well as the current size of your geocache data and the available space on the target directories.Please consider the following when you decide to store the geocache data on your external SD card:
- The initial moving of the geocache data might take a long time depending on the amount of data to be moved. Please do not interrupt the process and make sure your device is sufficiently charged.
- If you remove the external SD card or the SD card is full the additional geocache data will no longer be available and c:geo might no longer work as expected.
No, the login via Facebook or Google is an option on the geocaching website only. In order to login to geocaching.com via c:geo you need to enter the username and password dedicated to the website.
In case you currently only use Facebook or Google to login to geocaching.com, you have to go to the Password Reset Page to set up a regular password first. Please note, that you have to logout from the Geocaching.com website first to reach the password reset page. After you got this password you can use it together with your username to log in with c:geo.
We are using a crowd sourced translation platform to improve the translation and even include new languages. If you see untranslated (i.e. English) or wrong strings or your language is not even supported, you are invited to contribute on this platform!
Just create a free account on Crowdin and start contributing translations or vote for existing proposals to the c:geo Crowdin Project.
Publishing a new cache with c:geo is not possible and there are no plans to implement this function. However you can still use c:geo to record waypoints to help you planning your cache hide. To do so simply use the ‘Go to’ function which offers a history of the coordinates you entered there.
There are also other apps available on Google Play helping you to record and average coordinates for your new cache (e.g. GPS Averaging or Geocache Placer).
In order to e.g. beta-test an unpublished cache you will not be able to access the cache online (because it is unpublished) but you can import the cache via GPX or add the cache waypoints manually to another cache already stored on your device. Furthermore you can view your own unpublished caches with c:geo by searching for its geocode online.
c:geo is only a client for several geocaching platforms and does not hold own accounts or logins. To delete or disable your account you have to consult the website of the geocaching platform (e.g. on this page of geocaching.com).
Most of the time when you solve a puzzle for a mystery cache you might want to store the real final coordinates until you go out and log the cache. Although each user might handle this different, we recommend to use a helpful feature of geocaching.com:
Premium members of geocaching.com can store the real final coordinates of solved mystery caches (also working for all other cache types) on the website by tapping on the small pencil icon right next to the listing coordinates.
Once you have stored the real final coordinates on the website they will also be available in c:geo once you store/refresh the cache.
This means, that c:geo will display the cache icon on the real final coordinates and only have an additional waypoints referring to the listing coordinates.
Of course this is also working the other way around:
Open a cache in c:geo and create a new waypoint with the real final coordinates. Before saving the waypoint tap the selection “Set as cache coordinates in c:geo and on website”.
Once you saved the waypoint the real final coordinates will be uploaded to the website.
When importing caches via GPX file (e.g. download a pocket query) some data is missing. That is because the GPX file format does not contain all information which is available online.
The following information is missing or incomplete:
- Some logs (only the 5 recent logs are provided)
- Friends / Own logs
- Favorite points
- Spoiler and Log images
- Status of your watchlist
- GCVote rating
- Trackable inventory
This information can be downloaded by manual “Refresh”, either individually cache by cache or for all caches in a list.
If you have a given coordinates plus direction and distance you have to perform a projection to obtain the resulting coordinates.
To perform a projection simply add a new waypoint to a cache, enter the start coordinates and fill the field for distance and direction accordingly. If you save this it will result in a waypoint with the target coordinates.
If you want to perform a projection on an existing waypoint this is only possible if the waypoint is user defined. If it is a waypoint defined by the owner you need to duplicate the waypoint to a user defined waypoint at first by selecting “Duplicate waypoint” after tapping on its coordinates.
If this is happening to you, please check that your device has the correct date, time and time zone information. For security reasons the Opencaching API will reject requests which are not matching the server time (± 5 minutes).
On some devices the Internet browser does not correctly redirect back to c:geo after you logged in on the opencaching website but tries to open a website like “callback://www.cgeo.org[…]”. This is a faulty behavior of the Internet browser you are using, please try another Internet browser application to perform the authorization.
c:geo is shown as “Not supported” for your device on Google Play:
This means that either your device is running on an Android version below 4.1 or it does not support GPS.
Android versions below 4.0 are no longer supported by c:geo.
If you are on a minimum Android version of 4.1 but your device has no GPS and you still want to install c:geo on it, you have to install c:geo manually by downloading the APK file here. But be aware, that you cannot navigate to caches without GPS!
If you are a Chromebook user and want to install c:geo, have a look at this article for more details on how to sideload (manually install) an APK on those devices.
If you see this message your device will no longer be supported in upcoming c:geo versions. We decided to drop the support of Android versions below 5.0. Only a very minor percentage of our users is affected.
The reason for this is, that we want to include more features and further improve usability and stability. Newer Android versions offer a lot more possibilities which we simply cannot use if we have to be compatible to Android 4.
There will be no more c:geo updates for devices below Android 5.0. Therefore some online functions do no longer work, or might fail in future. You can however still use c:geo for offline Geocaching (e.g. by importing GPX files and exporting field notes).
Please check if the manufacturer of your device offers an update for your device. If there is no official update it may also be possible to use a Custom ROM if it is available for your device. If nothing can be done to update your device, you should consider using a new(er) device running on an Android version as recent as possible.
c:geo needs the following permissions to do its job and will only use them for that purpose:
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Location
Of course c:geo needs access to the GPS on your device to locate your position and calculate distance and direction to geocaches.
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Photos/Media/Files
c:geo will write data onto your phone storage or SD card as soon as you save geocaches for offline use. Furthermore c:geo will use your phone storage for import and export of files and reading of offline maps.
Additionally there are optional permissions for the following purpose:
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Contacts
c:geo can lookup geocacher names in your contacts to directly contact them from c:geo. Look here for details.
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Notifications
c:geo can show notifications about the download progress for offline maps and caches.
Generally we do not recommend to install an outdated version of c:geo, because it might no longer work as expected as newer versions often include adaptions to changed functions of the geocaching platforms. We strongly recommend not to go back but to apply all updates as soon as they are available.
We cannot guarantee that older versions will still work!
If you however still want to install an old version (e.g. for testing purposes) you can find a version history with download option in our GitHub Release History. Please be aware that you need to uninstall a newer version of c:geo on your device before installing an older version as downgrading is not possible.
You can download the newest version of c:geo directly to your device from here.
No, c:geo is written for Android and has more than 50,000 lines of code. We will not port it to iOS or other non Android systems because it is too much work. Furthermore the iOS AppStore / Apple is very restrictive and most of us don’t like it.
But c:geo is open source! That means that everyone can get the code from GitHub and rewrite it for other operating systems. Feel free to port (and maintain) it, but be aware of the open source license terms.
Sometimes users are asking us how to clone the content in their c:geo installation from one device to another (e.g. in case they got a new device).
Our user guide provides a step by step procedure for this: Migrate c:geo to another device
There is a good chance your data is still available! (… if you haven’t switched off automatic backups in c:geo) Uninstalling c:geo should not delete the public (visible) c:geo folder structure, which you have configured a “base” folder for. Normally this is “/cgeo” on your device. Beneath that folder there should be a folder “backup”, and beneath that a couple of more folders containing backups of the c:geo database and its configuration (look for “/cgeo/backup/auto” and subfolders of this, which are named after creation date/time).
If such a folder exists, you can go to c:geo’s main screen, select “backup/restore” and then the “restore a different backup” button. Then you can select the folder with the newest available backup and let c:geo restore the data from there.
Be aware: This will remove all data currently stored in c:geo since you have reinstalled the app! And it will restore the data you had at the point in time when the latest automatic backup was created, which may not be the most up-to-date state! (For the future you may want to decrease the interval in which c:geo creates automatic backups.)
Android has different mechanisms to provide location information to apps:
- Network based location information derived from Wi-Fi signals and mobile networks
- GPS position information derived from the device GPS receiver
You should make sure to enable both of these sources to get the best possible location information in c:geo in every situation. This can usually be done in your device settings (not in c:geo itself) in a menu called “Locations” or similar. You can also reach this menu by tapping on the GPS status shown on the lower corner of the c:geo main screen.
Please select all possible sources in that menu or (in newer Android versions) select the “High accuracy mode”.
Furthermore you should check if your device supports “Google Play Services” and eventually enable the usage of that in c:geo:
Menu → Settings → System → “Use Google Play Services”
Of course c:geo needs quite some battery power as it utilizes almost all sensors of your device to always determine the current position and direction as needed for Geocaching. Nevertheless we implemented sophisticated methods to optimize the power consumption over the last years. If you want to further minimize the battery consumption you can additionally active the low-power mode as described in this FAQ entry.
While you are using c:geo GPS should always be active except if you are in the settings menu. Only if you put your device to standby (switch off the screen) or switch to another app GPS will be deactivated to save battery. We have no plans to change this behavior or introduce another setting for this. If you wish to keep GPS always on, we recommend to use a dedicated app for this (e.g. GPS Lock).
Some users complained that their device needs a long time to reobtain a GPS fix after it was switched off. So we decided to keep GPS active while c:geo is being used (except in the settings menu).
To save more battery you can you select Menu → Settings → System → “Activate low-power mode”. c:geo will then use high precise location (GPS) only if needed. This means, that e.g. on cache lists, cache descriptions, trackable screens GPS might be switched off or only used periodically.
In a major percentage of these cases the problem is within your device. c:geo only uses the position and compass information provided by the Android system.
Please first of all try to calibrate the compass sensors of your device:
On most devices this can be done by turning the devices around all of its axis three times or moving it horizontally in shape of the number 8 until the compass shows the right magnetic direction.
Please be aware that electric fields (such as high voltage lines near to you) or magnetic fields (e.g. a phone cover with magnetic lock) might influence the device sensors.
If the problem is still not solved you should try another app with compass functionality (e.g. GPS Status & Toolbox) to verify your device capabilities.
If the compass works normal in other apps but not in c:geo you might experience a problem of the rotation sensor.
In this case please go to Menu → Settings → System and activate “Use orientation sensor”.
If nothing helps and the problem persists, please contact us and provide detailed information about your device, the compass misbehavior and what steps you already tried to resolve the problem.
Paris/France is the default location if c:geo is unable to get any location information on your device, no home coordinates are set on geocaching.com and c:geo never before had any information about your position since start of your phone.
Please make sure all location sources are activated in your device settings. Please check this FAQ entry for more information.
If you had a GPS fix at least once while c:geo is running it should remember this as your last position and open the live map at this position. Additionally you can set your home coordinates on this page on geocaching.com. c:geo will then use these coordinates if no other location information is available.
Please first of all check if you enabled all positioning methods on your device as described in this FAQ entry.
We received reports, that on some devices the “Google Play Services” might be faulty. If all location methods are enabled but you still have problems, please try to switch off the usage of “Google Play Services” in Menu → Settings → System → “Use Google Play Services”.
Please make sure that live mode is enabled. You might have accidentally disabled it:
Live Map → Menu → Enable live
You can see whether live is enabled or not by looking at the headline:
“Map” means live mode is disabled, “Live Map” means live mode is enabled
If still no caches are loaded please make sure you are logged in correctly in c:geo.
In order to use Google Maps in c:geo you need to have Google Play Services installed using a recent version on your device. This is a precondition by Google to use the Maps service.
A button will be shown on the screen to allow to install/update Google Play Services on your device. This requires a Google account and access to the Google Play Store app.
If you do not want or cannot install it, you can use one of the OSM maps supported in c:geo. Simply tap the map icon in the title bar and change to another map source than Google.
Starting with c:geo version 2021.03.16-RC1 we were forced to change the method c:geo reads map theme files from your storage. Unfortunately the new access method provided by Android is much slower to read many small files (such as in map themes). If you are using a custom map theme this could impact the time needed to initially render the map.
There are two possible ways to fix the problem. The fix is not related to the offline map files itself, but only to map theme files:
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c:geo now supports zipped map themes:
You can put the content of your themes folder into a zip archive and place this zip file into the theme folder instead. Alternatively download a zipped theme from your offline map provider (or via the c:geo map downloader) and directly place this file into your themes folder without unzipping it first.
This solution brings a comparable opening performance of the map as before. -
c:geo now supports a sync function for themes:
While the zip solution should be the prefereed method, you can also stay with unzipped theme files and instead let c:geo buffer the theme files internally. This method however is only recommended to advanced users with good knowledge of file storages and themes.
To activate the sync go to c:geo Menu → Settings → Map and activate the function “Synchronize themes to app-private folder”. Make sure to check the size of the data to be synced in the following dialog, before confirming the sync!! The size should (depending on how many themes you use) only be some kB up to a few MB. Do not activate the sync if the shown size is unreasonably high! In that case your theme folder contains unrelated data, or you might use the same folder for maps and their themes. You should separate and clean up the data first and/or set the correct theme folder.
If you are not sure, that you are doing it right, please use the zip solution instead (as described above).
If you notice any problems or have further questions, feel free to contact support@cgeo.org.
There is no final information available from Groundspeak yet, how Adventure Labs will be implemented into their app interfaces and/or websites. Therefore Groundspeak explicitly asked us to include this restriction, which is also present in other Geocaching apps. In spirit of good collaboration of c:geo and Groundspeak we decided to respect their wishes for now.
If we would include all currently available data for both member types, we might later end up with removing functions, if they are no longer available by Groundspeak’s future interfaces.
No, you have to use the Adventure Lab app by Groundspeak to play the Adventure Lab Cache.
You can install/open their app and be directed to the selected Adventure Lab cache by tapping on the Adventure Lab icon in the cache details view in c:geo.
Maybe you applied a filter, which accidentally also filters out adventure lab caches.
As for example adventure lab caches do not have any D/T-rating, filtering for certain D/T-values will exclude adventure labs as a consequence. In such cases you should enable the option “Include inconclusive results” in the advanced filter setting to have all caches included, where the filter criteria cannot be applied.
By default Lab2Gpx uses the geocode prefix “LC” for Adventure lab caches. Due to technical reasons c:geo has to use “AL” as prefix for Adventure Lab caches.
Therefore please configure Lab2Gpx to use “AL” as prefix when creating your GPX files, to gain full compatibility to c:geo.
Additionally you should select “Zipped GPX with waypoints” when downloading the GPX for best results in c:geo.
Go to c:geo Menu → Settings → Services → “Geocaching.com Adventure Lab” and deactivate this service.
Send to c:geo is a quicker way to transfer a cache opened in your browser to your c:geo. You will find all relevant information for installation and usage here: send2cgeo
If the registration fails, the reason can be one of the following:
- Your device does not have Internet connection.
- Our servers are down or busy.
- A communication error or timeout occurred.
You should try again in a couple of minutes/hours and if the problem persists please contact our support.
Yes, multiple devices can be on multiple browsers.
You need to “Register the device” for every browser. The PIN can only be used once. Afterwards you can send caches to c:geo from each of the registered browsers and they will be retrieved on all registered devices on which the import is currently active.
Please check your browsers cookie settings. It is required to allow third party cookies for send2cgeo.
Look into your geocaching.com browser tab: If there is a cookie symbol with a red X at the end of the URL dialog, tap on it, and in the popup tap “Maintain cookie blocking” (or similar) and permit [*.]send2.cgeo.org.
For recent versions of Google Chrome you need to apply a workaround which is described on our send2cgeo page.
The main purpose of c:geo is to have an online access to your geocaching platform. However c:geo also provides offline functionality to use it without any network connection (e.g. while caching abroad).
You can find more information in the chapter Offline Caching of the c:geo user guide.
This is not (yet) possible.
While we are against mass logging of caches still batch sending offline stored logs might be meaningful as this is another use case. Therefore we are thinking about implementing this but we encourage you to use the existing field note submission for the time being.
c:geo offers full support for geocaching.com Trackables as well as for GeoKrety.
More information about Trackable management with c:geo can be found in our user guide. To learn more about logging GeoKrety with c:geo you can also refer to the FAQ of geokrety.org.
While for reading GeoKrety information no login is required, you need a dedicated account on GeoKrety.org to log these trackables with c:geo.
If you do not yet have an account you can create it on the Geokrety.org registration page. Afterwards go to Settings → Services → GeoKrety.org in c:geo, enter your login data and authorize to the webpage.
Once you are authorized you can log GeoKrety with c:geo as described here.
Some functionalities which are available on the GeoKrety.org webpage are not (yet) supported with c:geo as either the current version of the interface does not support it or we did not yet have time to implement it:
- Mark a GeoKret as “missing”
We are now using Google Play location services if they are installed on your device. This location services might not be compatible with external GPS receivers depending on your Android version.
If you have problems using the GPS signal from the external receiver in c:geo, you have to disable the usage of those location services in:
c:geo Menu → Settings → System
Some Xiaomi devices use some proprietary dark mode implementation, which does obviously not work according to Android standards. This results in cache type icons, attribute icons and other graphical elements to be either not shown at all or shown in wrong coloring.
Please look into your device settings and search for a function called “dark mode” or “color optimization”. Either switch off this function completely or configure, that c:geo is excluded from this feature.
c:geo is not designed to work with multiple user accounts at the same time, but you can switch manually to a new user account by applying the following steps:
- Go to settings → services → geocaching.com
- Long tap on “Update or remove authorization”
- Enter the new username / password c:geo will then reconnect with the new account data. A similar procedure applies for the other geocaching services. Be aware that some stored data still relates to the old user account (eg. “found state”).
It allows you direct access to your phonebook when tapping on a username in c:geo. As it is a plugin it will only work if also c:geo itself is installed on your device.
When you tap on a username in c:geo (e.g. in the cache logbook) the menu will contain an item to open the corresponding contact card in your phone contacts. This will allow you to directly call or message the user.
The username of the person needs to be stored in the ‘name’ or ‘alias’ field of your contacts in order for the plugin to match the geocaching username to the contact.
Please make sure you stored the geocaching name of the person like it is shown in c:geo in the ‘alias’ field of the contact in your contacts list.
Alternatively the plugin will also match if the geocaching name equals the full name stored in your contacts list.
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What information is collected by the c:geo contacts plugin?
The contacts plugin needs the permission to access the contacts on your device. It will access your contacts in order to be able to find the contact data of other geocachers.
The c:geo contacts plugin will access your contacts only on your demand if you select the menu item “Open contact card” in c:geo. As long as you don’t use that function the plugin will never access any data of your contacts.
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How is the information used by the c:geo contacts plugin?
After you select “Open contact card” the c:geo contacts plugin will read your contact data to find a possible match of the geocachers name in the name or nickname field of your contact data. It will neither write to your contact data nor store any of your contact data within c:geo or the c:geo contacts plugin itself.
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With whom is the information shared?
Your contact data will neither by copied into c:geo nor shared with third parties.
As c:geo cannot retrieve this information from the website, we have to calculate the favorite percentage ourselves. Since c:geo does not know how many finders could theoretically award a favorite point to the cache (only those, who are premium members) we can only calculate using the favorite points divided by the number of total finds.
This means, that the percentage shown in c:geo will be less then the percentage shown on the website. There is nothing we can do about this for the time being.