||Defining search and rescue (SAR) as searching for and supporting the people who are in distress or imminent danger. A search is "an operation normally coordinated by a Rescue Coordination Center or rescue subcenter, using available personnel and facilities to locate persons in distress" and rescue is "an operation to retrieve persons in distress, provide for their initial medical or other needs, and deliver them to a place of safety." Search theory is the scientific study of mathematical methods and algorithms for developing optimal search plans. It is one procedure of application, and it was developed by the USN during World War II to aide in searching for enemy submarines and finding downed Allied fliers adrift on the ocean.|
In the ocean environment, wind and current making search objects to drift over time unless they are anchored, moored or stranding. The better the drift of the object is known, the more likely it will be found. The earlier the object is found, the greater the chance of survival will be. Therefore, it is the key that how to simulate the drift of object quickly and right. The first job to do is making a search and rescue system.
The search object drift at sea by main physical forces include ocean current, tidal current, wind current, and leeway. Search area is a circle and drawing projected position as the center and total drift error as the radius.
In this research, we use system dynamics to make the model of drift and radius of search, and a list of all parameters specify the definition and meaning. We create the database to find the corresponding parameters by relevant information. Inputting parameters to the system dynamics model to calculate the drift force and the search radius, then use ArcGIS to simulate the trajectory of drift.