An open roof construction for a vehicle includes a roof opening with longitudinal and transversal side edges provided in a stationary roof part of the vehicle. The frequency conversion block includes a divider for dividing the oscillation frequency, N frequency mixers cascaded from one another and a band-pass-filter, which are cascaded in this order. The sensor module sums the light from the first and second optical channel modules and detects one or more light transitions as a first registration mark of a first image of the page moves past the first optical sensor module and as a second registration mark of a second image of the page moves past the second optical channel module. When an end user accesses the reporting program, the reporting program provides a graphical map image to the end user on the end user’s computing platform.