135 Geographical Squadron (Reserves), Royal Engineers is an Army Reserve sub-unit of 42 Engineer Regiment (Geographic). 135 are based at Mercator House in Ewell, Surrey.
135 Geographic Squadron (Reserves) is responsible for providing personnel capable of producing, supplying and distributing mapping and associated geographic products in support to Defence 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.