# Transmitting Location Data

The eStela Mobile App (available for Android and iOS) acts as the primary tracking device in the system. It’s the recommended method for boat tracking during races due to its convenience and reliability.

### Why Use the Mobile App?

Using the mobile app instead of external trackers has several advantages:

1. Every boat already has a phone with GPS and mobile data.
2. No need to deliver and collect devices for each race.
3. No deposits or equipment management required.
4. Mobile phones continuously improve — better GPS, lower data usage, and longer battery life.
5. eStela releases frequent updates, ensuring compatibility and access to new features.

### How to Transmit Location Data

1. Install the eStela Mobile App from the Apple App Store or Google Play.
2. Log in using your Mobile Access Key (provided by your tracking administrator).
3. Tap `Activate tracking` to start transmitting your location.
4. Select the duration of the tracking:\
   • 2 hours\
   • 4 hours\
   • 1 day\
   • Indefinite (requires manual stop or closing the app)

#### Important App Settings

To ensure accurate and uninterrupted tracking:

* Allow all necessary location permissions
* Disable battery optimization for the app
* Keep the phone connected to a power source during tracking if possible

If there’s a problem (e.g., no GPS, incorrect permissions, signal loss), the app will show a clear error message with instructions on how to fix it.

### What Happens With Your Location Data?

* If a tracking session is active, your location will be sent to eStela’s servers and your boat will appear on the live map.
* If no tracking session is active, your location data will be discarded automatically.

### Offline Mode and Connectivity Loss

If your phone loses internet connection, the app will store all location data locally. Once the connection is restored, it will automatically upload the stored data.

The app can store up to 7 days of tracking data in offline mode.


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