Changing and more complex threats (pollution, stream of refugees, terrorism etc.) result in Swedish support teams taking part in international peace keeping operations being brought face to face with new problems and demands. Support team personnel often operate in areas where the infrastructure is eliminated, unknown infectious diseases are ravaging and where land and waters are heavily polluted. This situation brings about both acute as well as long-term health problems. Therefore, the need for information related to medical issues (MedUnd) is increasing, with reference to the normal clinical picture, logistics, medical capacity and pollution picture. In international peace keeping operations of today the possibility of obtaining timely a systematic overview of the complex threats in a mission area is non-existing. The information is sometimes arriving too late and essential facts are lost to those working in the field. This affects matters ranging from the possibility of choosing the proper protection equipment to the location of camps and, too, the assessments of health risks and preventive measures directed to the personnel. There is a demand for the development of a MedUnd operative support as well as for a systematic presentation of complex facts regarding a specific mission area in order to considerably facilitate evaluation, studying and decision-processing. In order to describe the current situation and potential problems to be handled by the support team personnel, the Division of NBC Defence in Umeå, has carried out a pilot study by combining MedUnd and geographical information systems (GIS). The Swedish Armed Forces, the Environmental Section, financed the work.