135 Independent Geographical Squadron, Royal Engineers (Volunteer) are the only Territorial Army support for 42 Engineer Regiment (Geographic). 135 are based at Mercator House in Ewell, Surrey.
They are responsible for providing personnel capable of producing, supplying and distributing mapping and associated geographic products in support of their regular Army counterparts, anywhere in the world. In recent years members on the Squadron have deployed to Former Yugoslavia, Iraq and Afghanistan, and have been on exercise to Germany and USA. 135 have also regularly taken the lead role in the bi-annual Sovereign Base Area Boundary Survey in Cyprus.