A method of generating an area of location pattern, the area comprising a plurality of sub-areas, the method comprising: for each of the sub-areas, determining (a) metadata identifying the sub-area, and (b) the position of the sub-area relative to the area; transmitting to a receiving device (a) and (b) for each of the sub-areas; retrieving from memory, associated with the receiving device, image information corresponding to the metadata, thereby generating in memory an image corresponding to the area of the pattern to be generated.