Abstract: An ad-hoc network comprising multiple nodes in, each node including a transmitter, a receiver, a tactical database, storing a partition of the geographical area into multiple cells, each cell is associated with coordinates in a geographical coordinate system, storing tactical data the nodes, a geographical cell processor for identifying the geographical position of the node in associating the node with one of the geographical cells, a situation awareness and collision avoidance messages processor for transmitting/receiving situation awareness messages, the situation awareness messages include the node identification representation, the node geographical position and the node protocol information the node, together with additional of the nodes being defined as cell members of the geographical cell, the cell-member is determined a cell-representative for the geographical cell, the cell-representative, transmits cell-representative messages, to nodes that are within a determined distance from the cell-representa

Abstract: An apparatus for displaying at least one image with respect to a line-of-sight (LOS), with an image source, a display processor and a displaying unit. The display processor is coupled with the image source and the displaying unit. The image source provides at least one spatially unregistered image, and the display processor spatially registers the spatially unregistered image with the LOS, thereby generating a respective at least one spatially registered image. The displaying unit displays at least one spatially registered pixel on a displaying surface. The display processor includes a storage unit, an image processor and a pixel locator, the pixel locator being coupled with the image processor, wherein the storage unit stores the spatially unregistered image. The image processor selects at least one projection pixel to be displayed and the pixel locator determines, in each spatially unregistered image, the location of the spatially registered pixel corresponding to the selected projection pixel.