When hovering over the 2D map while searching for a plot, the zone that includes the plot is marked by a blue overlay. This zone overlay is visible up to a 20m zoom level.
Other map overlays can be found in the right-hand corner of the 2D map. Through these layers, you can access information about contamination, natural hazards, ISOS sites, and various kinds of noise. The legend for all the filters is located in the bottom left corner.