Both Departments and Sites have GPS location settings. If you're entering stuff in the database, start by entering Sites with a circle that reasonably approximates the area the site can be received. For Departments, use either a circle or rectangle, whichever best approximates the service area of the Department entity.
Sites frequently have overlapping coverage areas, and Departments are often carried on more than one Site, so that there is a backup if a site fails, and to reduce coverage dead spots. Don't assume that there is a 1:1 relationship between Departments and Sites.
Sites frequently have overlapping coverage areas, and Departments are often carried on more than one Site, so that there is a backup if a site fails, and to reduce coverage dead spots. Don't assume that there is a 1:1 relationship between Departments and Sites.