---
title: "Signal sources — USA"
description: "Underlying signals feeding USA metric models."
slug: "/docs/datasets/usa/supply"
last_updated: "2026-08-31"
country: "USA"
country_slug: "usa"
supply_count: 1
supply_ids: ["gps-usa"]
---


# Signal sources — USA

- [GPS](/docs/datasets/usa/supply/gps-usa.md) — Panel-based GPS observations from a representative sample of US mobile users. Used as the primary signal for USA foot-traffic and movement metrics.