To search the map you need, first move the general map with the help of mouse or navigation buttons. Choose larger scale of general map for quick move and smaller scale for defining the interested region.
When choosing one or another type of displayed maps above general map, the information about presence or absence of corresponding maps appears in the form of icons [+] or [-].
Press [+] or [-] and you will see information about maps which are available for selected square, or information about availability of maps of other types in this square.
More than 18000 of military topographic maps are available for download through the website poehali.org. Maps, schemes, sailing directions and other topographic material.