In these days the practical first order approximation is more familiar to us than the second order equation which expresses the motion of ships. That is the reason because the former is often used for few changes of the steering as z maneuvering test or manual steering. This paper investigates by the analogue computer if the first order approximation may be applied to the automatic steering with changes of higher frequency. And besides the author want to analyze the linear adjustment in autopilot and its optimal adjustment.