Privacy
Effective November 3, 2026
MarsGPS collects no personal information. This applies to the iPhone and iPad app and to the website, marsgps.org.
The app
The app has no accounts and no sign-in. It contains no advertising, analytics, or tracking code. The planet, the routes, the elevation data, and every ground-view photo are inside the app, so it works without a connection.
When you zoom in closely, the app asks NASA's Mars Trek and Esri's map servers for higher-detail imagery and elevation of the area you are looking at. Those requests name the area being viewed and, like any request on the internet, carry your IP address; the app sends nothing else, and NASA's and Esri's own privacy policies cover what their servers log. At launch the app also checks marsgps.org for an updated copy of its own map files, so fixes can arrive without a new App Store release. That check carries your IP address and nothing about you.
The app remembers a few choices on your device, such as whether you prefer miles or kilometers. Deleting the app removes them.
The website
The website sets no cookies and shows no advertising. It counts page views with Vercel Web Analytics, which uses no cookies and no identifiers that could follow you between sites: each view is recorded with the page, the referring site, the approximate location of the connection, and the device and browser type, under a hashed visitor key that is discarded after 24 hours. To pick miles or kilometers, the site's edge server looks at the country of your connection and answers with a unit system; the country is not stored and does not reach the site's code. The site remembers the same display choices in your browser's local storage, which you can clear at any time.
The site is hosted by Vercel. Like any web host, Vercel's servers receive your IP address and browser type when they send you the page, and may keep them briefly in their logs to operate and protect the service. I do not use those logs to identify visitors.
Sharing, retention, and deletion
Because MarsGPS collects no personal information, there is none to share, sell, keep, or delete, and no consent to withdraw.
Children
MarsGPS is a map for anyone curious about Mars. It collects no information from anyone, including children.
Changes
If this policy changes, the new version will be posted here with a new date.
Contact
Annas Rahman, contact@annasrahman.com