Explanatory example based on the freight search:
In this example 'search without radius',
2 freights will be found in "D"
with the postal codes beginning with "652".
The red rectangle drawn on the map
shows the maximum "north-south" and "west-east" boundaries where all hits are located.
(This red rectangle is the basis for the radius search)
In the example a perimeter of "20 km" is added.
The maximum "north-south" and "west-east" boundaries of the original search
(marked by the red rectangle) are extended by the selected "50 km".
This corresponds approximately to the blue rectangle
in which all matching matches are displayed.