Privacy Policy

Publisher and contact

Nguyễn Trà My · tramyy1902@icloud.com

Contact us about support, privacy, account deletion or content reports. Do not send passwords or private invitation keys.

Data we use

TrailRelay uses precise location to record routes, guide active trips, show consenting group members and deliver safety alerts. A TrailRelay ID, display name, group information, route reports and optional report photos are used only to provide features you choose.

What stays on your iPhone

Saved routes, recording drafts, safety history, private invitation keys and your private identity key are stored on your device. Private keys are protected by the iPhone Keychain.

What reaches our service

When you create or join a shared trip, TrailRelay sends an account identifier, trip metadata and encrypted route or live-location payloads to Supabase. Route and live-location contents are encrypted on your iPhone; the private route key is not sent to the service. Apple Maps receives map requests under Apple's terms and privacy policy.

Accounts, chat and feedback

An anonymous account is created when TrailRelay first connects. Trip chat is encrypted on your iPhone. Sending feedback uploads your message, selected images and app/device details. Reporting a chat message sends the selected readable text to our support team. APNs device tokens are stored to deliver safety notifications.

Photos and camera

You choose photos from the system picker or take a photo after granting camera access. New chat photos are compressed to at most 250 KB before encryption; profile photos to at most 40 KB. Profile names and photos are visible to people using the related sharing features. Account IDs, trip names, memberships and timestamps are not hidden by trip-content encryption.

Offline maps and trip preparation

Downloaded maps, terrain tiles, walking graphs, saved forecasts and local trip plans are stored on your iPhone. Shared plan notes, checkpoints and photos are encrypted before upload; trip owners control contributor access. Map requests disclose the requested area and network address to OpenFreeMap. Walking routes request a bounded area through our backend from OpenStreetMap Overpass using Private.coffee or VK Maps; elevation tiles are requested from the public Mapzen terrain dataset on AWS. Weather requests pass a destination through our backend to MET Norway, rounded to three decimal places. Provider data is cached by area; short-lived account request records enforce rate limits. Saved forecasts may be stale offline.

Hazard reports and watches

GDACS provides regional flood and wildfire reports, not complete street-level warnings. Feed requests disclose your network address, not your precise GPS position. Watch connections are optional; an approved connected watch may receive trip, location and safety information. Bluetooth access can be turned off in iPhone Settings.

Sharing and consent

Location is shared only after you start or join an active Relay and enable sharing. Other members of that Relay can see your current position and safety status. Sharing stops when you leave or the Relay ends.

Trip chat retention

Ending a trip deletes its chat, photos and live alerts for the whole group. Leaving removes your access while other members keep their data. Saved routes and offline maps are kept. Photo cleanup retries on the server if needed.

Copies and support records

Trip deletion cannot erase screenshots or exported copies kept by other people. Feedback and content reports already submitted to support are separate from temporary trip chat and are not automatically deleted when a trip ends. Contact us to request access, correction or deletion; server backups and security logs may be subject to separate retention.

Retention

Local routes remain until you delete them. Invitation rooms expire on their displayed date. Temporary live-location and live-route rows are removed when a Relay ends; expired server trips are scheduled for automatic cleanup. Safety history is limited on device and can be deleted in Settings.

Your choices

You can deny location, camera or notification access in iPhone Settings, stop live sharing, delete local routes and safety history, or permanently delete your TrailRelay account and associated server data inside Privacy & Data.

Tracking

TrailRelay does not use advertising identifiers, third-party advertising or cross-app tracking.

Deletion requests

End or leave an active trip before deleting your account in Settings > Privacy & Data. If you cannot open the app, email the publisher. We may need to verify the request belongs to your account; never send your password or invitation key.

Safety

TrailRelay is a coordination aid, not an emergency service. SOS delivery depends on device power, connectivity and system notification availability. Contact local emergency services when immediate help is required.

Satellite source and license

Satellite imagery: EOX Sentinel-2 cloudless, modified Copernicus 2016–2017 (CC BY 4.0). Download requests reveal the selected tile area and network address to EOX; saved imagery stays on this iPhone. CarPlay uses Apple Maps driving directions and the phone location permission.