Creating a map mashup using Views

Sure, what you want to do is create a view with the display type of "openlayers data" (in the same menu where you choose page, rss-feed, block etc), and then grab a geofield wkt field. This creates an views-powered openlayers layer than you can put on any of your openlayers preset maps.

I usually then just use panels to display this map with this layer... However, if you don't use panels (or need exposed filters) you can use the views "OpenLayers Map" display type instead.

I have installed
openlayers
geofield
geocode (probably not needed)

I have created node type (named customer) with input widget for Location field: openlayers map
I can succesfully input location points on openlayer google map and display it on node view

I can create view and display fields Location data (latitude/longitude only)

I can display all locations in a table and display openlayers default map (on OSM but not google map ?!)

I have followed your instructions above to create "openlayers data overlay" and it lets me map the appropriate fields to title/latitude/longitude/data/description

but

the "openlayers data overlay" does not have a URL path ? the preview only shows code ? what is the connections with the "page display" ?

How can I get all my locations on ONE google map ?

I would appreciate any pointers

Here is a dump of the display preview from "openlayers data overlay"

You can use the following parameters in your styles as dynamic values
------------
${title_rendered}
${title}
${field_location_rendered}
${field_location}
${field_location_1_rendered}
${field_location_1}
${body_rendered}
${body}
${field_location_2_rendered}
${field_location_2}
${name}
${description}

------------
The following is a dump of the data that is rendered from this display. It is used for debugging purposes only.
        array (
  0 => 
  array (
    'projection' => '4326',
    'attributes' => 
    array (
      'title_rendered' => '<a href="/en/another-customer">another customer</a>',
      'title' => 'another customer',
      'field_location_rendered' => '38.188',
      'field_location' => '38.188',
      'field_location_1_rendered' => '26.0284',
      'field_location_1' => '26.0284',
      'body_rendered' => '<p>another customer</p>',
      'body' => '<p>another customer</p>',
      'field_location_2_rendered' => '
    <div style="width: 600px; height: 400px;" id="openlayers-container-openlayers-map-02f4cb76" class="openlayers-container openlayers-container-map-geofield_formatter_map2">
      <div style="width: 600px; height: 400px;" id="openlayers-map-02f4cb76" class="openlayers-map openlayers-map-geofield_formatter_map2"></div>
    </div>',
      'field_location_2' => '
    <div style="width: 600px; height: 400px;" id="openlayers-container-openlayers-map-02f4cb76" class="openlayers-container openlayers-container-map-geofield_formatter_map2">
      <div style="width: 600px; height: 400px;" id="openlayers-map-02f4cb76" class="openlayers-map openlayers-map-geofield_formatter_map2"></div>
    </div>',
      'name' => '<a href="/en/another-customer">another customer</a>',
      'description' => '<p>another customer</p>',
    ),
    'wkt' => 'POINT(26.0284 38.188)',
  ),
  1 => 
  array (
    'projection' => '4326',
    'attributes' => 
    array (
      'title_rendered' => '<a href="/en/haus-fay-chios">Haus Fay Chios</a>',
      'title' => 'Haus Fay Chios',
      'field_location_rendered' => '38.1878',
      'field_location' => '38.1878',
      'field_location_1_rendered' => '26.0284',
      'field_location_1' => '26.0284',
      'body_rendered' => '<p>haus fay chios</p>',
      'body' => '<p>haus fay chios</p>',
      'field_location_2_rendered' => '
    <div style="width: 600px; height: 400px;" id="openlayers-container-openlayers-map-ed69c8d4" class="openlayers-container openlayers-container-map-geofield_formatter_map2">
      <div style="width: 600px; height: 400px;" id="openlayers-map-ed69c8d4" class="openlayers-map openlayers-map-geofield_formatter_map2"></div>
    </div>',
      'field_location_2' => '
    <div style="width: 600px; height: 400px;" id="openlayers-container-openlayers-map-ed69c8d4" class="openlayers-container openlayers-container-map-geofield_formatter_map2">
      <div style="width: 600px; height: 400px;" id="openlayers-map-ed69c8d4" class="openlayers-map openlayers-map-geofield_formatter_map2"></div>
    </div>',
      'name' => '<a href="/en/haus-fay-chios">Haus Fay Chios</a>',
      'description' => '<p>haus fay chios</p>',
    ),
    'wkt' => 'POINT(26.0284 38.1878)',
  ),
  2 => 
  array (
    'projection' => '4326',
    'attributes' => 
    array (
      'title_rendered' => '<a href="/en/teset-customerc">teset customerc</a>',
      'title' => 'teset customerc',
      'field_location_rendered' => '38.388',
      'field_location' => '38.388',
      'field_location_1_rendered' => '26.1248',
      'field_location_1' => '26.1248',
      'body_rendered' => '<p>customer</p>',
      'body' => '<p>customer</p>',
      'field_location_2_rendered' => '
    <div style="width: 600px; height: 400px;" id="openlayers-container-openlayers-map-87ebe336" class="openlayers-container openlayers-container-map-geofield_formatter_map2">
      <div style="width: 600px; height: 400px;" id="openlayers-map-87ebe336" class="openlayers-map openlayers-map-geofield_formatter_map2"></div>
    </div>',
      'field_location_2' => '
    <div style="width: 600px; height: 400px;" id="openlayers-container-openlayers-map-87ebe336" class="openlayers-container openlayers-container-map-geofield_formatter_map2">
      <div style="width: 600px; height: 400px;" id="openlayers-map-87ebe336" class="openlayers-map openlayers-map-geofield_formatter_map2"></div>
    </div>',
      'name' => '<a href="/en/teset-customerc">teset customerc</a>',
      'description' => '<p>customer</p>',
    ),
    'wkt' => 'POINT(26.1248 38.388)',
  ),
)

Subscribing, greetings, Martijn

Closing. @GiorgosK, if you still need any help with creating the Openlayers display, there's pretty good documentation on their module page. Re-open if you need any specific help.