# SIMT

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Said Elimam](https://cerebralvalley.ai/u/saidelimam)
- **GitHub:** https://github.com/saidelimam/simt-echo
- **Demo video:** https://youtu.be/AVNrF17zDU8
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4813

SIMT ECHO is an offline-first spatial navigation system that transforms a short smartphone walkthrough into a portable, shareable spatial memory for others.
Built on a Kotlin Multiplatform architecture for Android and Wear OS, the platform allows one person to record a path through an unmapped or GPS-denied physical space and transfer that route to another user, who can navigate the exact path completely offline in Airplane Mode without pre-existing floor plans or external beacons.

The platform divides navigation intelligence into three distinct layers:
• Deterministic Sensor Truth: Physical movement, step counts, turn geometry, and relative distance are strictly captured and calculated by on-device Inertial Measurement Unit (IMU) sensors and Pedestrian Dead Reckoning.
• Meta AI Visual Grounding: With creator consent, keyframes are processed by cloud vision models—including Llama 4 Scout, Muse Spark 1.3, and Segment Anything Model (SAM 3.1)—to detect, segment, and label permanent visual landmarks without fabricating spatial coordinates.
• Probabilistic Local Guidance: During replay, an along-route Ghost particle filter and the ECHO Parallax monocular visual engine fuse real-time step events, turn signatures, level changes, and visual view-strips to track progress and display an honest uncertainty aura.

## More from Meta Global AI Developer Hackathon

- [AutoMuse](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4810)
- [Viil Sentinel](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4811)
- [Puddle](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4812)
- [Chat Computer](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4814)
- [AxVigil](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4815)
- [Vwoosh](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4816)

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