The present document defines the stage-2 service description for the LoCation Services (LCS) feature on GSM@ which provides the mechanisms to support mobile location services of operators@ which are not covered by standardized GSM services. CCITT I.130 [4] describes a three-stage method for characterization of telecommunication services@ and CCITT Q.65 [5]defines stage 2 of the method. The LCS feature is a network feature and not a supplementary service. This version of the stage 2 service description covers aspects of LCS e.g.@ the functional model@ architecture@ positioning methods@ message flows etc.