A load handling crane comprising: - a crane base; - a column which is rotatably mounted to the crane base so as to be rotatable in relation to the crane base about an essentially vertical axis of rotation; - an actuator for rotating the column; - a crane boom system comprising two or more liftable and lowerable crane booms (7, 9), which are articulately connected to each other, and hydraulic cylinders (8, 10) for lifting and lowering the crane booms (7, 9), wherein a first crane boom of the crane boom system is articulately connected to the column and a second crane boom of the crane boom system is articulately connected to the first crane boom; - an electronic control device for controlling said actuator and said hydraulic cylinders (8, 10) so as to control the rotation of the column and the movement of the crane booms (7, 9); - a portable manoeuvring unit with one or more manoeuvring members (61a, 61b) configured to be manoeuvrable by a crane operator in order to control the position of the crane booms (7, 9), wherein the portable manoeuvring unit is configured to transmit control signals to the electronic control device related to the manoeuvring of said manoeuvring members (61a, 61b); and - a high seat arrangement comprising a high seat platform and an operator's seat, wherein the high seat platform is connected to the column so as to be rotatable in relation to the crane base together with the column, and wherein the operator's seat is mounted to the high seat platform, characterized in: - that the high seat arrangement comprises a stand, which is mounted to the high seat platform, and an attachment configured for releasable engagement with the portable manoeuvring unit, wherein the attachment is fixed to the stand and wherein the manoeuvring unit is detachably mountable to the attachment in order to allow the manoeuvring unit to be carried by the stand; and - that the stand is configured to position the attachment in such a position in front of the operator's seat that a crane operator sitting on the operator's seat is allowed to manoeuvre said manoeuvring members (61a, 61b) on the portable manoeuvring unit when it is mounted to the attachment. - a crane base; - a column which is rotatably mounted to the crane base so as to be rotatable in relation to the crane base about an essentially vertical axis of rotation; - an actuator for rotating the column; - a crane boom system comprising two or more liftable and lowerable crane booms (7, 9), which are articulately connected to each other, and hydraulic cylinders (8, 10) for lifting and lowering the crane booms (7, 9), wherein a first crane boom of the crane boom system is articulately connected to the column and a second crane boom of the crane boom system is articulately connected to the first crane boom; - an electronic control device for controlling said actuator and said hydraulic cylinders (8, 10) so as to control the rotation of the column and the movement of the crane booms (7, 9); - a portable manoeuvring unit with one or more manoeuvring members (61a, 61b) configured to be manoeuvrable by a crane operator in order to control the position of the crane booms (7, 9), wherein the portable manoeuvring unit is configured to transmit control signals to the electronic control device related to the manoeuvring of said manoeuvring members (61a, 61b); and - a high seat arrangement comprising a high seat platform and an operator's seat, wherein the high seat platform is connected to the column so as to be rotatable in relation to the crane base together with the column, and wherein the operator's seat is mounted to the high seat platform, - that the high seat arrangement comprises a stand, which is mounted to the high seat platform, and an attachment configured for releasable engagement with the portable manoeuvring unit, wherein the attachment is fixed to the stand and wherein the manoeuvring unit is detachably mountable to the attachment in order to allow the manoeuvring unit to be carried by the stand; and - that the stand is configured to position the attachment in such a position in front of the operator's seat that a crane operator sitting on the operator's seat is allowed to manoeuvre said manoeuvring members (61a, 61b) on the portable manoeuvring unit when it is mounted to the attachment.