The DETECTION in the present case indicates the discovery but not the location (POSITIONING) which may or may not be followed by subsequent locations in a tracing eventuality. The last certain position of the target is defined, in the air and naval field, as DATUM. In the current geostrategic scenario, the threat must only be seen in a direct war confrontation. In the other sense the target, in the DPE Triangle, enlarges the concept threat. In fact, in the rescue missions of human life at sea the threat must be understood only as the impediments to act to complete the rescue.