MI4 was a Section of the Directorate of Military Intelligence (DMI) established in December 1915.
Commonly known at that time as the Geographical Section, General Staff (GSGS).
MI4 provided RE officers to the Air Ministry from as early as 1924 to support the development and production of both civil and military navigation aids and charts.
The topographers of today reside at the Defence Geographic Centre at MOD Feltham, Middlesex.
The organisation is a direct descendent of the Depot of Military Knowledge and to this day provides geographic products, data and services to UK Defence, Partners Across Government and to the UK's allies around the world.