A method for utilization within a graphical user interface having at least one pull-down menu and at least one tool bar. A processor at the vehicle analyzes vehicle data, and determines when predetermined threshold values have been reached for particular parameters. and is fixed by soldering to the plurality of signal transmission terminals 210a etc. The image data within these frames F are taken out and distortions of the image due to the characteristics of the fish-eye lenses 13 and 15 are eliminated to obtain first and second transformed frame data. Second selection means for selecting between the first adder means output and the second path metric signal produce a second survivor path metric in dependence on the second comparator means comparison.