OpenCelliD is a community-built open database of cell towers and their estimated locations. Contributors record nearby cell identifiers with GPS locations, and the data is processed into cell location estimates. The dataset covers GSM, CDMA, UMTS, LTE and 5G NR networks and is available through an API and CSV downloads, supporting device geolocation without GPS.
A not-for-profit volunteer project providing information and database access for research into records of British merchant seafarers and ships, mainly covering 1863 to 1913, with ship records from 1855 to the 1950s. It offers search guidance, FAQs, links to other maritime records, and states that privately commissioned research is not undertaken.
Explore railway infrastructure on a world map.
WiGLE maps wireless networks, Wi-Fi access points, Bluetooth devices, and location data.
Online historical map collection with over 151,000 maps and related images, including rare 16th through 21st century maps of continents and regions. The searchable database includes the LUNA Viewer and an AI Search Assist. A physical collection is hosted at the David Rumsey Map Center at Stanford University Library.
Civicus Monitor is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
Linguistic Maps is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
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A not-for-profit volunteer project providing information and database access for research into records of British merchant seafarers and ships, mainly covering 1863 to 1913, with ship records from 1855 to the 1950s. It offers search guidance, FAQs, links to other maritime records, and states that privately commissioned research is not undertaken.
Explore railway infrastructure on a world map.
WiGLE maps wireless networks, Wi-Fi access points, Bluetooth devices, and location data.
Online historical map collection with over 151,000 maps and related images, including rare 16th through 21st century maps of continents and regions. The searchable database includes the LUNA Viewer and an AI Search Assist. A physical collection is hosted at the David Rumsey Map Center at Stanford University Library.
Civicus Monitor is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
Linguistic Maps is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
