page_title: Geo-fence
hierarchical_section_title: Geo-fence
caption_attribution_description: English: Two geo-fence zones defined in Golden Gate Park, San Francisco, California, USA, by a Global Positioning System application.
context_page_description: A geofence is a virtual perimeter for a real-world geographic area. A geo-fence could be dynamically generated—as in a radius around a point location, or a geo-fence can be a predefined set of boundaries.
  The use of a geofence is called geofencing, and one example of usage involves a location-aware device of a location-based service user entering or exiting a geo-fence. This activity could trigger an alert to the device's user as well as messaging to the geo-fence operator. This info, which could contain the location of the device, could be sent to a mobile telephone or an email account.
context_section_description: A geofence is a virtual perimeter for a real-world geographic area.  A geo-fence could be dynamically generated—as in a radius around a point location, or a geo-fence can be a predefined set of boundaries (such as school zones or neighborhood boundaries).
  The use of a geofence is called geofencing, and one example of usage involves a location-aware device of a location-based service (LBS) user entering or exiting a geo-fence. This activity could trigger an alert to the device's user as well as messaging to the geo-fence operator.  This info, which could contain the location of the device, could be sent to a mobile telephone or an email account.
caption: Two geofences defined in a GPS application
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