CONTAINER CRANE COMPRISING REFERENCE MARKER

It is provided a container crane (1) comprising: a spreader (4) configured to controllably attach to a container (8); a container trolley (3) to which the spreader is attached via cables, the container trolley being provided on an upper part of the container crane and being horizontally movable along a first direction (x); a first sensor arrangement (11) mounted on the container trolley, the first sensor arrangement being usable to determine a position of the container; a second sensor arrangement (12, 12a-c) being usable to determine a position of a target (18); and at least one reference marker (15, 15a-b) provided fixed, in at least two dimensions, to a horizontal support (5a-b) provided along the first direction between vertical structures of the container crane, the at least one reference marker (15, 15a-b) being provided vertically lower than the first sensor arrangement (11) and the at least one reference marker (15, 15a-b) being detectable by the first sensor arrangement (11).