be electrically isolated from the remote control system. However, it may be mechanically linked to the main control handle, allowing telegraph orders to be given using the same user interface as for remote control orders. Traditional EOTs (though in a more modern form) can still be found on all nuclear powered ships and submarines as they still require an engineering crew member to operate the throttles for the steam turbines that drive the propellers. EOTs can also be found on older vessels that lack remote control technology, particularly those with conventional steam engines. Remote control systems on modern ships usually have a control transfer system allowing control to be transferred between locations. Remote control is usually possible from two locations: the bridge and the Engine Control Room (ECR). Some ships lack a remote control handle in the ECR. When in bridge control mode, the bridge handle directly controls the engine set point. When in Engine Control Room mode the bridge handle sends a telegraph signal to the ECR and the ECR handle controls the set point of the control system. In local control, the remote control system is inactive and the bridge handle sends a telegraph signal to the local control position and the engine is operated by its manual controls in the engine room. Order transmission At least two telegraph units and alarms must be installed, one on the bridge and one in the engine room. The order is given by moving the bridge unit's handle to the desired position on the dial face. This sends an electrical signal to the EOT placed in the engine room whose pointer acquires a position according to the signal given from the bridge. An audible alarm sounds at both ends. Accordingly, the watch-keeping engineer acknowledges the order by moving the handle of the engine room EOT to the required position and takes necessary action. This sends an electrical signal to the bridge EOT unit, causing its pointer to acquire the respective position. The alarm stops ringing to acknowledge that the order has been carried out. Typical dial positions Many past ships have the following dial indications: Flank ahead (1940–present) (US only) Full ahead Half ahead Slow ahead Dead slow ahead Standby Stop Finished with main engines Dead slow astern Slow astern Half astern Full astern Emergency astern (1940–present) Any orders could also be accompanied by an RPM order, giving the precise engine