GSGS series 4414. Sheet 2016, Second Edition. The Nord de Guerre grid on this sheet is based on the French Geographical System or graticule. The geographical values of the sheet corners and graticule tick marks on this sheet are based on the German Geographical System or graticule. To convert German Geographical vaules to French Geographical values subtract 1.3" from German Latitudes and add 3.15" to German Longitudes. Lambert modified conical orthomorphic projection. Nord de Guerre Grid.