Paper presents basic information on the Constant False Alarm Rate (CFAR) algorithms and assessment of their practical efficiency in maritime FM-CW radar. Experimental research comprised qualitative assessment of the different CFAR algorithms done by the comparison of radar video signals presented by installed in the Gdynia Maritime University FM-CW radar type CRM-203 utilised these algorithms and pulse radars with digital (Raytheon Pathfinder MK2 and NSC 34) and analogue (Racal Decca AC 1690) display units