You're welcome.

As I mentioned above, that was the first thing I did.

Nope you said:
Components> AdsManager> Configurations> Gmaps Module > Default Latitude and Longitude

I said:
Ads Manager - Fields and then go to your gmap field.
At the bottom you'll see options:
Default Lat
Default Lng

Also there is system plugin that I believe AdsManager uses.
You can try setting default Long and Lat there too:

1. For gmap field ( in the situation when user post a new ad) - as hrvoje mentioned
In adsmanager fields search for you gmap field click on it and then :
you have a lot of options like:
Default Lat
Default Lng
Default Zoom

2. for gmap module (if you choose to display the map module on any page ..like on front page )
in adsmanager configuration you have a tab: gmap module
there you have a lot of options like:
Default latitude
Default Longitude
and many more

see the difference form the options one is the field.. one is a tab
In plugin manager : System google maps you will not find any help

Hello and thank you to both,
I had already done the first setting , now I also set the plugin GooglMaps , but the result doesn't change ...!

This is "insert a new ad" page