This paper wants to explain howNanaku, as local knowledge of the coastal community in Taniwel sub-district, western Seram Regency had an important role in the marine activities. The purpose of the study was to explain the local knowledge of the community related to the skills and accuracy in marking natural phenomena related to marine activities. This study used descriptive qualitative methods, which included data collection, data reduction, data presentation, and drawing conclusions or verification. The results showed thatNanakuwas passed down from generation to generation. Through this local knowledge, they can hold the process of making boats and fishing in the sea properly. This local knowledge was used as a natural marker and fishing guideline.Nanakuconsisting of twelve fishing skills;nanakumoon,nanakukarti star,nanakubeluku star,nanakuscaly clouds,nanakuhigh and low tide,nanakuwhirl wind,nanakuocean currents,nanakuwhen river water overflows/ floods ,nanakuseagulls lock,nanakuowl (boel),nanakulunar eclipse, andnanakulightning in Northeast at night. The conclusion showed that Nanaku still survives today and was not lost in the midst of technological developments.Nanakubecame a basic knowledge for a fishing profession which contributed to the economic life of the coastal fishing communities of Taniwel Seram.