UX specification: Blue dot and geolocation behavior ​

1. Initial map load & permissions ​

Expected behavior:

• Permission request: Upon opening the map, the system requests geolocation access via the browser.
• Initial viewport: Once permission is granted, the map automatically pans to the user’s current position (center-aligned).
• Zoom level: The system preserves the current zoom level. It does not automatically adjust the zoom to a predefined scale.
  • Note: If the user is far from the event location, the map will pan to their coordinates, but they may need to zoom in manually to see details.
• Floor awareness: The Blue Dot is visible only when the user is on the currently active floor. If the user is on a different floor, the icon appears dimmed (semi-transparent) to reduce confusion.

2. Navigation & movement logic ​

Is there a navigation mode?

Currently, ExpoFP uses a manual focus approach rather than a turn-by-turn navigation lock.

• Auto-centering: The camera follows the user only on the first position update. After that, the map remains user-controlled. To re-center, the user must tap the Find location button.
• Map rotation: The map does not rotate automatically to match the user’s heading. It remains North-up (or at the default floor plan orientation).
• Blue Dot orientation: The Blue Dot rotates based on the device’s compass to indicate the user’s facing direction.

3. Wayfinding & route snapping ​

When a route is active, the system applies smart snapping to improve stability and usability:

• Snapping threshold: If the user is within 7.5 meters of the suggested route, the Blue Dot snaps to the route line. This reduces visible position shifts caused by GPS jitter.
• Route progress: As the user moves, the completed portion of the path changes color to grey, indicating progress.
• Automatic rerouting: If the user deviates from the route by more than 10 SVG units (approximately 5–7 meters) and is near a booth, the system automatically recalculates the route.

4. Visual States ​