Developer mode will help you to work with your maps more quickly. To turn developer mode on, open ammap_settings.xml file with text editor, find "<developer_mode>" node (it is in the top) and set it to “true”:
<developer_mode>true</developer_mode>
Now, then moving mouse over the map, you will notice that some info will appear:
You will need this information a lot then working with your map. You can easily copy this info to clipboard by clicking right mouse button and choosing appropriate menu item.