Help and product information for Datumark.
Datumark turns your iPhone into a precise field-survey instrument. Capture coordinate-stamped photos, measure distances and areas on site, convert between coordinate systems, and export clean data files — entirely on device. No account. No cloud. No tracking. Your position data never leaves your phone.
Does the app need an account or subscription?
No. It is a one-time-download app with no account, advertising, analytics, or in-app purchase.
Does it work offline?
Core features and bundled reference data work on-device without a developer-operated service.
Where is my information stored?
Your field photos, waypoints, tracks, coordinate settings, and export choices remain in the app's local storage.
How do I remove local data?
Use available delete or reset controls. Removing the app removes its local container, subject to backups you control through Apple.
What are the limits?
GNSS accuracy depends on the device and environment. Verify coordinates with appropriate survey equipment when precision or safety matters.
Email support@shadowfetch.com with the app name, device model, iOS version, and a concise description of the issue.