Fig. 2From: An autonomous GPS geofence alert system to curtail avian fatalities at wind farmsDemonstration of the geofence alert system placed around a hypothetical wind farm. A telemetered bird ingresses the geofence boundary (top left), triggering an SMS alert and increasing the GPS fix rate from 15 min (green dots) to 30 s (red dots). When the bird egresses the geofence zone (lower right) a second SMS alert is broadcast and the fix rate returns to the standard 15 minBack to article page