# Geofence entrance or exit ## Overview A geofence is a designated area on a map that acts as a virtual boundary. This rule tracks when trackers enter or exit the specified geofence area. Users will receive notifications whenever their objects cross these geofence borders. For example, if a piece of building machinery leaves the designated zone, a company employee can be notified through the user interface, email, or SMS if configured in the rule. ![](https://2096203889-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F446mKak1zDrGv70ahuYZ%2Fuploads%2Fgit-blob-68bc10ec064c9e2ed4fdca57b246a8774785c6ca%2Fimage-20240805-231934.png?alt=media) This functionality provides valuable insights and control over the movement of objects, ensuring adherence to predefined boundaries. It enhances security by alerting users to any unauthorized movement or potential theft outside the specified geofence area. Additionally, it enables efficient asset management by allowing users to track and optimize the utilization of their equipment within designated zones. ## Rule settings #### Geofences Specify the geofences that will trigger notifications when crossed. You can list multiple geofences within a single rule. For common settings, please refer to [Rules and Notifications](https://navixy.com/docs/user/guide/events-and-notifications/movement-monitoring/broken-reference). ## System operation details * The "Geofence entrance or exit" alert has a 60-second reset timer, which means the alert will not trigger more often than once every minute. If an event occurs while the rule is waiting for the reset, the platform will omit the event, including in reports. * This rule is processed in the cloud and is not tied to any specific hardware, allowing it to be applied to multiple trackers simultaneously. This flexibility enables you to manage several trackers within a single rule. * Please note that the system may generate an entrance/exit alert even if GPS drifting occurs. Although invalid GPS coordinates are filtered, small GPS drifts can still appear in the track. Various methods to prevent GPS drifting events are available, depending on the tracker model's functionality. For details on preventing GPS drifting, refer to the device manual. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://navixy.com/docs/user/guide/events-and-notifications/movement-monitoring/geofence-entrance-or-exit.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.