Since 1970, the Ports and Harbours Bureau, Ministry of Land, Infrastructure, Transport and Tourism and its asso-ciated organizations have been conducting the Nationwide Ocean Wave information network for Ports and HArbourS (NOWPHAS). Among these organizaions, the Port and Airport Research Institute (PARI) is playing an important role to process and analyze the wave records obtained at the network, and to present the wave statistics in a series of annual reports. This Technical Note of PARI covers the wave data obtained throughout the year 2020 at the 79 network sta-tions (26 stations on the coast of the Sea of Japan, 4 stations on the East China Sea, 1 station on the Sea of Okhotsk, and 48 stations on the Pacific Ocean). In this 2020 Annual Report, Noshiro on the Sea of Japan side was added to NOWPHAS.Eighteen GPS buoys, which can measure the vertical motion of the mooring buoys due to sea surface elevations every one second by using the RTK-GPS technolgy, are installed. Among these 79 stations, the significant wave is obtained every 20 minutes at 76 stations and every 2 hours at 3 stations. This note presents the statistics on the frequency spectrum analysis at 69 stations. In 2020, the records of the local highest significant wave at 2 wave obser-vation stations were updated.

Key Words: NOWPHAS, wave observation, wave statistics, GPS buoy