A portable self-standing electromagnetic (EM) field sensing locator system with attachments for finding and mapping buried objects such as utilities and with intuitive graphical user interface (GUI) displays. Accessories include a ground penetrating radar (GPR) system with a rotating Tx/Rx antenna assembly,...http://www.google.ca/patents/US7990151?utm_source=gb-gplus-sharePatent US7990151 - Tri-pod buried locator system
