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README.md
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@ -157,17 +157,3 @@ All default to black background with white icons.
Your person entities need GPS coordinates (latitude/longitude). Activity sensors come from the [Home Assistant Companion App](https://companion.home-assistant.io/) or similar integrations. Your person entities need GPS coordinates (latitude/longitude). Activity sensors come from the [Home Assistant Companion App](https://companion.home-assistant.io/) or similar integrations.
For Google Maps, you'll need an API key from [Google Cloud Console](https://console.cloud.google.com/) with billing enabled. OpenStreetMap works out of the box. For Google Maps, you'll need an API key from [Google Cloud Console](https://console.cloud.google.com/) with billing enabled. OpenStreetMap works out of the box.
## Notes
### Speed Prediction Feature
The speed-based activity prediction feature requires GPS position history and works best with frequent updates. The card calculates speed based on position changes over time, so:
- Speed display will appear after at least 2 position updates
- Prediction accuracy improves with more frequent GPS updates (e.g., every 10-30 seconds)
- Activity prediction uses the following thresholds:
- **Still**: < 1 km/h
- **Walking**: 1-7 km/h
- **On Bicycle**: 7-25 km/h
- **In Vehicle**: > 25 km/h
The speed calculation is performed locally in your browser and uses a Haversine formula for distance calculation between GPS coordinates.