Electromagnetic ground conductivity surveys (EM surveys) are rapidly becoming an essential part of improving farm performance and future development. The EM-31 can be used to measure soil conductivity to a depth of up to 4 metres, which in turn provides information such as: Suitability of area for development Detecting soil salinity Location of groundwater monitoring devices Location of sites for soil sampling Suitability of sites for water storages Detection of seepage areas in drains, channels and storages Survey of embankments to assess compaction properties Collection of soil data for property and catchment planning Locating buried services, tanks, drums etc. Groundwater contamination and landfill studies as well as groundwater resource evaluations The EM-31 is mounted on a 4-wheel motorbike and is equipped with GPS to enable accurate plotting of the machine position. The data is downloaded onto a computer and is used in conjunction with other data to produce an apparent conductivity map (sub-soil salinity map). Property boundaries and infrastructure details are added and the image can be overlayed onto a topographic map or aerial photograph to allow easier identification of problem areas. Using GPS co-ordinates from the map, particular problem areas or those requiring further investigation can be accurately located and monitored.