Map nomenclature

To make it easier and faster to look for map sheets of different scales and ground location, every map sheet is assigned unique name, called Nomenclature. Nomenclature (map sheet title) is placed on the top (north) part of sheet either in the middle or right side. Usually Nomenclature is following by a name of largest town located on the map.

Structure of Nomenclatures depends on map type (topographic, geographic, aeronautic, city plans, etc), scale and coordinate system.

Russian Nomenclature structure based on 1:1 000 000 map sheets. Any of them covers ground area of 6 degrees of longitude and 4 degrees of latitude. Nomenclature of 1:1 000 000 map sheet includes number of «Latitude zone" (or Row ) (Latin capital character starting from equator (A-zone) to the north)  and number of «Longitude zone" (or Column)(integer number starting from 180 degrees longitude(0-zone) to the east). Thus, for example 1:1000000 map sheet of area around the city of Smolensk is named N-36 (Smolensk).