An imaging system for superimposing at least two images, and a related method for superimposing at least two images, which images are obtained from separate or independent image sources. A single mapping based view of a user selected geographic area onto which multiple image data sets from separate computer systems are displayed whilst simultaneously isolating separate input data channels. At least one first image data set and/or a position code (generated by a position code generator) is transferred to a position code extractor via at least one secure transmission channel. The secure channel ensures isolation of input data from the separate input data channels of different computer systems. The first image is combined with a second image to provide a combined single image view of the selected geographic area. Transmission of an image data set, with associated position code, negates the need to pass data sets between separate computer systems.