The Smart AtoN(Aids to Navigation) project aims to upgrade the facilities of AtoN to provide new additional information to nearby ships and unmanned ships. This paper deals with methods for collecting various sensor data through standardized interfaces; the NMEA-0183(serial line), the NMEA-2000(CAN), and the NMEA OneNet(IPv6). The AIS(Automatic Identification System) and the AIS-ASM(Application Specific Message) are considered as communication means for providing sensor information to nearby ships. In this paper, we summarize existing NMEA sentences for collecting sensor data and AIS-ASM messages that can be used to deliver sensor data to ships. Information provided from the smart AtoN through AIS, ASM, etc. may be presented on the shipborne displays that complies with the IEC62288:2021 standard.

The SV1 service - NAMAS(Navigation Monitoring & Assistance Service) collects ship’s position data in all South Korean waters, and predicts the next positions, calculates the CPAs between ships within a certain distance, evaluates basic collision risk and each vulnerability, then integrates to the navigational collision risk. This paper describes the functions and background chosen in the navigation risk solving system; Data characteristics, framework of navigation risk solving system, and data structures and methods for efficient computation for CPA calculations and detecting accident risk situations.