A tandem roller for compacting an underlying ground, comprising - a machine frame supported by a front compaction drum with respect to a direction of travel (VR, RR) and a front compaction drum with respect to the direction of travel, the front compaction drum being spaced apart from the front compaction drum in a longitudinal machine direction, and - an operator platform with a driver's seat oriented in the direction of travel (VR, RR), the driver's seat being displaceable by means of an adjusting device from an operating position at a center of the operator platform with respect to the horizontal extension of the operator platform transverse to a forward direction in the direction of at least one side of the tandem roller transversely to the longitudinal machine direction to at least one defined first operating position and in the same direction to the side to at least one defined second operating position, the defined second operating position being spaced farther apart from the center of the operator platform than the defined first operating position, wherein in the first and in the second defined operating position of the driver's seat an operator sitting in the driver's seat looks in each case in the direction of the direction of travel (VR, RR), characterized in that the tandem roller has at least two direction finding aids (22, 23), the at least two direction finding aids (22, 23) being arranged offset from each other in a projection to a common virtual horizontal plane, the first direction finding aid being associated with the defined first operating position and the second direction finding aid being associated with the defined second operating position, such that the first direction finding aid for an operator sitting in the driver's seat located in the first operating position and the second direction finding aid for the operator sitting in the driver's seat located in the second operating position each indicate a ground point in line-of-sight extension from the driver's seat, which, viewed parallel to the direction of travel, is in each case located in linear extension of the end-face ground contact point of that end face of the compaction drum (5a, 5b) located at the front in the direction of travel which is located in the direction of the adjustment direction of the driver's seat from the defined first operating position in the direction of the second defined operating position of the driver's seat, and that the at least two direction finding aids (22, 23) are arranged permanently and stationary on the machine frame. - a machine frame supported by a front compaction drum with respect to a direction of travel (VR, RR) and a front compaction drum with respect to the direction of travel, the front compaction drum being spaced apart from the front compaction drum in a longitudinal machine direction, and - an operator platform with a driver's seat oriented in the direction of travel (VR, RR), the driver's seat being displaceable by means of an adjusting device from an operating position at a center of the operator platform with respect to the horizontal extension of the operator platform transverse to a forward direction in the direction of at least one side of the tandem roller transversely to the longitudinal machine direction to at least one defined first operating position and in the same direction to the side to at least one defined second operating position, the defined second operating position being spaced farther apart from the center of the operator platform than the defined first operating position, wherein in the first and in the second defined operating position of the driver's seat an operator sitting in the driver's seat looks in each case in the direction of the direction of travel (VR, RR),