How do you get the device's geolocation in MAUI?

Use Geolocation.Default.GetLocationAsync (last-known or a fresh request with GeolocationRequest specifying accuracy and timeout). Request location permission first. GetLastKnownLocationAsync is faster but may be stale; GetLocationAsync forces a fix.

var request = new GeolocationRequest(GeolocationAccuracy.Medium,
    TimeSpan.FromSeconds(10));
var loc = await Geolocation.Default.GetLocationAsync(request);