Szukana fraza: [Abstract = "This paper details a proposal for the position control system of a two\-axis ship\-mounted tracker. Aspects of the non\-linear dynamics governing Line\-Of\-Sight \(LOS\) errors between the tracker and the target are presented. It is shown that the regulation of LOS errors can be achieved by introducing a feed\-forward term based on the target's velocity. This velocity is not measurable, and an estimator is required."]