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This paper describes on the consolidation of AIS and ARPA radar positions by comparing the AIS andARPA radar information for the tracked ship targets using a PC-based ECDIS in Busan harbor, Korea. Theinformation of AIS and ARPA radar target was acquired independently, and the tracking parameters such asship s position, COG, SOG, gyro heading, rate of turn, CPA, TCPA, ships name and MMSI etc. weredisplayed automatically on the chart of a PC-based ECDIS with radar overlay and ARPA tracking. TheARPA tracking information obtained from the observed radar images of the target ship was compared withthe AIS information received from the same vessel to investigate the difference in the position andmovement behavior between AIS and ARPA tracked target ships. For the ARPA radar and AIS targets to beconsolidated, the differences in range, speed, course, bearing and distance between their targets wereestimated to obtain a clear standards for the consolidation of ARPA radar and AIS targets. The averagedifferences between their ranges, their speeds and their courses were 2.06% of the average range, 0.11knots with the averaged SOG of 11.62 knots, and 0.02with the averaged COG of 37.2, respectively. Theaverage differences between their bearings and between their positions were 1.29 and 68.8m,respectively. From these results, we concluded that if the ROT, COG, SOG, and HDG informations arecorrect, the AIS system can be improved the prediction of a target ships path and the OOW(Officer ofWatch) s ability to anticipate a traffic situation more accurately.Key words : Real-time position tracking, PC-based ECDIS, Consolidation of ARPA radar and AIS targets

Real-time position tracking of traffic ships by ARPA radar and AIS in Busan Harbor, Korea