Abstract: A collaborative information sharing system as described herein employs a graphical user interface (GUI) that displays a spaciotemporal rendering along with icons that represent items of interest, such as aircraft, vessels, radar equipment, and communications equipment. The GUI is also used to display item data that describes, defines, or identifies the items of interest. The item data may be provided by multiple information sources residing in different network security domains. The system combines item data governed by disparate security protocols in a manner that allows users having different security credentials to collaborate and share the information while still providing the required security and data protection.