SETTINGS

Auto-zoom thresholds

Speed cutoff (mph)

Zoom ≤ cutoff

Zoom > cutoff

Off-road search radius

How far to search for the nearest road when no road is within 80 m. Larger = slower response but works farther from pavement.

Query thresholds

Speed tiers (mph) that trigger a fresh road lookup. Crossing any tier boundary fires an immediate query. Below Stopped, queries repeat on an interval.

Stopped < (mph)

Slow < (mph)

Medium < (mph)

Highway ≥ (mph)

Stopped interval (s)

Offline Maps

Download road data for up to 3 counties. The app uses cached data automatically — no Overpass calls needed while driving through a cached area.

State

About this build

This is the Vercel testing build. It uses live OpenStreetMap data (via the Overpass API) and browser geolocation. Download counties above to use the app offline.

The offline Raspberry Pi build is a separate branch with bundled county data, MBTiles, and a USB GPS reader.

Tap Sim ON on the map view to walk a synthetic position around Shelbyville, IN — useful for testing without permitting location access.