Only one point on each OL map ?

Hi,

I use Addressfield, Geocoder, Geofield and Openlayers modules.
In a content type 'Conference', there are:

• a 'Postal address' field,
• a 'Geofield' field with 'Geocode from another field' widget.

For each 'Conference' node, I display an OL map (from Views). It works fine, but all the conferences addresses are marked on each map.

For example, if there are 3 conferences (C1, C2 and C3) with 3 different addresses, these 3 addresses are marked on the OL map in C1 node, C2 node and C3 node. But I want only C1 address is marked on C1 map, C2 address on C2 map and C3 address on C3 map.

To do this, I tried a page and a block with nid argument, and an entity content (EVA module), without success.

Is it possible ? If yes, how ?

Thanks in advance !