Privacy Policy

TrustZoneMap  ·  Last updated: 13 April 2026

Overview

TrustZoneMap ("the app") is a personal safety information app that displays UK crime data and includes an optional Family Fence feature for parental location monitoring. This policy explains what information the app uses and how it is handled.

Data We Collect

The app uses the following data:

• Device location (all users) — used to look up nearby crime data from the UK Police API. Your location is sent directly from your device to the UK Police API (data.police.uk) and is not stored by us.
• Device location (Family Fence — children only) — if you join a Family Fence group as a child member, your precise GPS location is stored in Google Firebase Firestore and shared in real time with the group admin (parent). This only occurs after explicit acceptance of the consent screen. Location data is updated approximately every 60 seconds while the app is open.
• Display name (Family Fence) — the name you enter when creating or joining a Family Fence group (e.g. "Dad", "Emma") is stored in Firebase Firestore and visible to the group admin.
• Anonymous device ID (Family Fence) — Firebase Authentication assigns a random anonymous ID to your device to link your location updates to your group membership. This ID cannot be used to identify you outside the app.

Family Fence — Parental Controls

The Family Fence feature allows a parent or guardian (the group admin) to monitor the real-time location and safety score of family members who have joined the group.

• The group admin's location is never stored or shared.
• Child members must explicitly accept a consent screen before their location is shared.
• Child members can see that their location is being shared at all times.
• Location sharing for child members is managed by the group admin and cannot be disabled from the child's device — this is intentional parental control behaviour.
• The group admin can remove any member at any time, immediately stopping location sharing.
• Dissolving the group immediately stops all location sharing.

Third-Party Services

The app uses the following third-party services:

• UK Police API — crime records for England, Wales, and Northern Ireland (public data).
• Nominatim / OpenStreetMap — address search and reverse geocoding.
• postcodes.io — UK postcode coordinate lookup.
• MapLibre GL JS with OpenStreetMap tiles — map rendering.
• Google Firebase (Firestore & Authentication) — used exclusively by the Family Fence feature to store and sync location data between group members. Data is stored in the EU (europe-west region). Google's privacy policy applies to data processed by Firebase.

Cookies & Tracking

The app uses no cookies or advertising identifiers. No data is sold to third parties. Firebase uses an anonymous device identifier solely for group membership — it is not used for advertising or analytics.

Data Retention

Family Fence location data is retained in Firebase Firestore only while a user is an active member of a group. When a member is removed or a group is dissolved, their location data is deleted immediately. To request deletion of any remaining data contact us at the email below.

Children

The Family Fence parental control feature is designed for use by parents and guardians to monitor the safety of children aged 13 and over. The app does not knowingly collect data from children under 13 without verifiable parental consent. Parents who set up Family Fence for younger children take responsibility for compliance with applicable laws (COPPA, GDPR-K).

Changes to This Policy

If this policy changes, the updated version will be published at this URL with a revised "Last updated" date.

Contact

Questions about this policy can be sent to trustzonemap@gmail.com.