Gultom, Feri, Gentio Harsono, Widodo S. Pranowo, and Dian Adrianto. 2022. “Sistem Informasi Pasang Surut Berbasis Android Di Wilayah Kerja Pangkalan TNI Angkatan Laut (Studi Kasus Belawan, Tarempa, Sibolga, Natuna Dan Cilacap): Android Based Tidal Information System in the Working Area of ​​the Naval Base (Case Study of Belawan, Tarempa, Sibolga, Natuna and Cilacap)”. Jurnal Chart Datum 3 (2):81-92. https://doi.org/10.37875/chartdatum.v3i2.121.