A system for engaging and disengaging a running tool with a liner in a downhole system comprising: a liner disposed in a borehole , the liner having at least one running tool engagement section including one or more liner anchor cavities ; and a running tool disposed within the liner , the running tool having at least one engagement module that is operable to move an anchor from a disengaged position to an engaged position and from an engaged position to a disengaged position; characterised by : an electronics module disposed at least one of in or on the at least one engagement module ; and a position detection system configured to detect relative positions of the liner and the running tool , the position detection system comprising: a marker installed within the liner ; and a sensor in the running tool and configured to detect the marker ; the position detection system configured to communicate the detection of the marker to the electronics module , wherein, once the detection of the marker is communicated to the electronics module , the anchor is movable into engagement with one of the one or more liner anchor cavities . a liner disposed in a borehole , the liner having at least one running tool engagement section including one or more liner anchor cavities ; and a running tool disposed within the liner , the running tool having at least one engagement module that is operable to move an anchor from a disengaged position to an engaged position and from an engaged position to a disengaged position; characterised by : an electronics module disposed at least one of in or on the at least one engagement module ; and a position detection system configured to detect relative positions of the liner and the running tool , the position detection system comprising: a marker installed within the liner ; and a sensor in the running tool and configured to detect the marker ; the position detection system configured to communicate the detection of the marker to the electronics module , wherein, once the detection of the marker is communicated to the electronics module , the anchor is movable into engagement with one of the one or more liner anchor cavities . an electronics module disposed at least one of in or on the at least one engagement module ; and a position detection system configured to detect relative positions of the liner and the running tool , the position detection system comprising: a marker installed within the liner ; and a sensor in the running tool and configured to detect the marker ; the position detection system configured to communicate the detection of the marker to the electronics module , wherein, once the detection of the marker is communicated to the electronics module , the anchor is movable into engagement with one of the one or more liner anchor cavities . a marker installed within the liner ; and a sensor in the running tool and configured to detect the marker ; the position detection system configured to communicate the detection of the marker to the electronics module , wherein, once the detection of the marker is communicated to the electronics module , the anchor is movable into engagement with one of the one or more liner anchor cavities . <EOS>