Now, the red circle is over the centre of that postcode area, not my/your house. What you would do now is zoom in on the red circle as much as possible using the + at the top of the cross on the right hand side of the map. When you have done that, place the cursor hand over the exact location of your house and click the right hand button of your mouse. A drop down menu appears - select using the left mouse button 'MOVE MAP TO HERE'. The map will recentre over your house. Now with the cursor hand over your house location once again right mouse click to get the drop down menu showing, this time select 'PLACE RED CIRCLE HERE' The red circle will now be over your house as it is with mine. What will also have happened is that below the map to the right will be your GPS coordinates. You have now in effect created your own Multimap page with a red cirlce over your house and your GPS coordinates below it. The good thing is you can save this page in the form of a link, you can then use the link in emails and on web pages to show people where you are. Simply click the link button top right of the map then highlight and copy all the HTML code in the popup box. Save that html in notepad for future use.
To convert coordinates from metric to Lat Lon and vice versa use this site HERE
The rest of this site is a travellers guide which gives you the details and coordinates of accommodation and places to visit throughout Europe.
Hope this helps