Two fixes based on feedback after the last commit: 1. The map wasn't following the position at all -- only the first fix recentered, later updates just moved the marker. Now every fix recenters (easeTo, not flyTo, after the first one, so it doesn't repeat that zoom swoop on every update) -- matches how GeolocateControl's own trackUserLocation always behaved. 2. GNSS should only be used when explicitly turned on via the sidebar "GNSS" icon, not whenever a receiver happens to have a fix -- simpler to test against the simulator that way, and puts the visitor in control of whether GNSS is engaged at all. GnssControl now owns following the map on its own (same flyTo-once/easeTo-after pattern) whenever it's enabled; LocateControl checks GnssControl#isEnabled() and, when true, just jumps to #getPosition()'s current fix and reuses its existing .gnss-marker instead of polling/marking on its own. Only falls back to the browser's own geolocation when GNSS is off. Verified end to end with the GNSS simulator: enabling sidebar GNSS recenters immediately and keeps following over several polls; clicking Locate while GNSS is on jumps to the same position without creating a second marker or touching its own active state; turning GNSS back off and clicking Locate correctly falls through to the browser geolocation path instead.