The Germans developed an electrical two-axis joystick around 1944. The device was used as part of the Germans' "Funkgerät" FuG 203 "Kehl" radio control transmitter system used in certain German bomber aircraft, used to guide both the rocket-boosted anti-ship missile "Henschel Hs 293", and the unpowered pioneering precision-guided munition "Fritz-X", against maritime and other targets. Here, the joystick of the "Kehl" transmitter was used by an operator to steer the missile towards its target. This joystick had on-off switches rather than analogue sensors. Both the Hs 293 and Fritz-X used FuG 230 "Straßburg" radio receivers in them to send the "Kehl's" control signals to the ordnance's control surfaces. A comparable joystick unit was used for the contemporary American Azon steerable munition, strictly to laterally steer the munition in the yaw axis only.