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Logger is an interactive command driven program for data logging on PDP-ll. It can also generate different signals, perform PID-control and make signal processing. During the logging it is possible to plot or print signals on the terminal. Commands can be entered via the terminal or in a command fi1e. For conversion of the stored signals to text form the program Convrt can be used.

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This paper deals with automatic steering of ships under the influence of disturbances from waves. The disturbance has been of two different types, a sinusoidal wave and a disturbance in the yaw rate. We have used both conventional state feedback regulators and adaptive regulators based on least square estimation and minimum variance control. In particular, we have investigated the behaviour of the