M.D.R. 3/347. Sheet number G2. Greenwich longitude of Istanbul is 28Â° 59' east, approximately. Magnetic declination is 7' east of True North for the year 1942. This map is drawn by No. 1 Drawing Unit, I.G.S.C.; Reproduced by 512 (A. Fd. Svy.) Coy., R.E., dated February 1942; Based on original Turkish maps at 1:200,000 scale, dated 1937; Roads revised from 1:200,000 Revision material. Located in the Lloyd Reeds Map Collection, call no. G 7430 s200 MC51D Sheet G2.