The purpose of field manual 21-26 is to provide a text on map and aerial photograph reading for training of military personnel already familiar with basic elements covered by FM 21-25 or who require more detailed instruction than is furnished by FM 21-25.

History

• 2001-07-20: Superseded by FM 3-25.26.
• 1993-05-07: Map Reading and Land Navigation. [pdf]
• 1987-09-30
• xxxx
• 1956-03-28: This revision, Map Reading, [pdf] supersedes FM 21-25, 15 August 1944, including C 1, 12 June 1945, C 2, 10 November 1950 and C 3, 13 October 1953; FM 21-35, Sketching, 1 June 1939, including C 1, 23 February 1942 and C 2, 15 April 1943; and TB ENG 90, 14 September 1949, too.
• 1953-10-12: Change No. 2
• 1945-11-30: Change No. 1
• 1944-12-23: This revision [pdf] supersedes TB 21-25-1, 2 March 1944; TB 21-26-1, 23 February 1944; and TC 66, 1944, too.
• 1942-05-15: Change No. 1
• 1941-09-17: This manual [pdf] supersedes TM 2180-5, September 28, 1938.