Privacy Policy

1. Scope

This policy applies to the DingHai app for iOS and iPadOS and to the privacy and support pages on this website.

2. On-device location processing

While anchor watch is active, DingHai processes your precise vessel position on your device to:

• place an anchor on the map and calculate the distance between the vessel and anchor;
• determine whether the vessel has moved beyond your safety range;
• draw the movement track for the current anchor watch; and
• continue monitoring on the Lock Screen or in the background and alert you to a potential anchor drag.

DingHai has no developer-operated server and does not transmit precise positions or tracks to the developer.

3. Local records

Anchor positions, tracks, safety ranges, start and end times, maximum drift, and display preferences are stored in the app's local data container. They are used to restore an active watch, show history, and retain your usual settings.

DingHai does not create user profiles or use these records for advertising, analytics, or cross-app tracking.

4. Apple system services

Maps, device location, notifications, and Live Activities are provided through Apple system services, including MapKit, Core Location, UserNotifications, and ActivityKit. Apple's own privacy policy applies to its processing through those services. DingHai includes no other third-party SDKs.

5. Permissions

• Location while using the app: shows the vessel position, places the anchor, and calculates distance.
• Always and precise location: continues anchor watch while locked, in another app, or when iOS wakes the app for a location condition.
• Notifications: alerts you when an anchor-drag risk is detected.

DingHai does not request microphone, camera, photo library, or contacts access and does not record audio.

6. Retention, deletion, and control

Anchor-watch records remain in the app's local data container until you delete them individually. Deleting DingHai removes its local data. Device backups are handled according to your Apple system backup settings.

You can revoke location or notification access at any time in Settings. Revoking a permission required for anchor watch will stop the corresponding protection.

7. Collection and sharing

DingHai does not collect, sell, or share personal data with the developer or with advertising, analytics, data-broker, or similar third parties. This website likewise uses no cookies, analytics, tracking pixels, or third-party fonts.

8. Intended use

DingHai is an anchor-watch aid. It does not provide emergency rescue or vessel control and cannot replace safe anchoring procedures, a human watch, or compliant marine equipment. Always maintain independent safety measures.

9. Updates and contact

If our data practices materially change, we will update this page and its effective date and provide an in-app notice when appropriate.

For privacy questions, contact the development team through GitHub Issues. Do not include vessel positions, tracks, or other sensitive information in a public issue.