A characteristic of target cognition using marine radar

The radio detection and ranging (RADAR) is one of the useful instruments which a navigator uses for attempting safe navigation at poor weather conditions. In case of poor weather and there are lots of similar targets, they sometime make an error for its direction when they find the target in the landscape from RADAR information - target´s direction, distance, echo size, echo shape, sweep and relationship among targets´ echo. We have to prevent the errors for attempting safe navigation. The purpose of this paper is to find characteristics of the target cognition using marine RADAR with three steps: 1) to propose the navigator´s model of the RADAR target cognition, 2) to evaluate the errors of the target cognition on the RADAR monitor and its judgment in the landscape, 3) to discuss the errors with the parallax.