No more contacts on the map

[lumat83]

Hi all

Here is my problem and I need your help

I would like to reduce the number of contacts shown on the map (red squares).

To do this, I've found the file contact.cfg of the data/cfg folder. But for all values, the problem persists.
For example, in the original file, there is this line :

Single Contact Min Size=1 ;[>0] minimum numbers of units in this type of group

My idea is to remove the appearance of all the contacts of less than 2 or 3 ships (to avoid the single ships) on the map. Then, I've replaced the 1 by 2. But it's always the same problem, I've always the appearance of ships alone.

I don't understand why. Can somebody say to me what's about of this line ?

And if exist an another file to modify this setting ?

Thanks, and sorry for my english