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Monitoring the movement of children is needed by parents to avoid things that are not desirable. GPS technology can be used to carry out surveillance via cellphones combined with virtual area restrictions (geofence) to increase supervision when parents are not near their children. This virtual area limitation will help provide automatic signals to parents when children move outside the permitted area. This application is built using the Unified System Development Process (USDP) method and applies the Haversine formula to calculate the distance between two positions on earth. The Haversine formula is used in the process of detecting whether an object is in the permitted area or not. The virtual area limitation in this application uses a circle shape. This application requires two actors, namely the parent actor who acts as a monitor and the child actor who acts as the object being monitored. Parents use Android phones to see children's movements via Google Maps and at the same time to manage the child's geofences so that monitoring is easier. Meanwhile, the child uses a smartwatch to send the latitude and longitude coordinates of his position to the firebase database server. The smartwatch device used by the child is lighter and more practical because it is worn on the hand.

APLIKASI PEMBATASAN AREA VIRTUAL (GEOFENCE) UNTUK PEMANTAUAN AKTIFITAS ANAK-ANAK MENGGUNAKAN SMARTPHONE DAN SMART WATCH