Pulau Gili raja merupakan salah satu pulau di Kabupaten Sumenep. Tingginya aktivitas masyarakat di sekitar pesisir tidak pernah lepas dari kondisi perairan salah satunya yaitu pasang surut. Penelitian ini bertujuan untuk mengetahui nilai komponen harmonik M2 dan S2, Perbandingan metode admiralty dan metode least square, dan tipe pasang surut. Pengambilan data pasang surut selama 15 hari. Pengolahan data pasang surut menggunakan metode Admiralty dan last square yang masing masing menghasilkan komponen harmonik M2 dan S2 serta nilai bilangan formzhal. Hasil analisa dari kedua metode tersebut didapat nilai M2 29 cm, 25 cm 29 cm pada tada primer dan 28 cm pada data sekunder dan nilai S2 17 cm, 14, cm, dan 16 cm pada data primer dan 9 cm pada data sekunder yang diolah dengan menggunakan metode admiralty. Nilai yang diolah dengan menggunakan metode least square didapat hasil M2 40 cm, 39 cm, 41 cm pada data primer 40 cm pada data sekunder dan nilai S2 17 cm, 18 cm, 16 cm pada data primer 19 cm pada data sekunder. Nilai bilangan Formzhal data primer dan data sekunder memiliki nilai 0,25

The Gili Islands is one of King Island in Sumenep. The high activity of communities around the coast is never separated from the waters of one of these conditions i.e., UPS and downs. This research aims to know the value of the harmonic components of M2 and S2, the admiralty method Comparison and least square method, and type of ups and downs. Tidal data retrieval for 15 days. Data processing method using Admiralty tide and last square of each harmonic components produce M2 and S2 as well as the value of the number of formzhal. The results of the analysis of the two methods obtained the value of M2 29 cm, 25 cm 29 cm at tada primary and 28 cm in the secondary data and the value of S2 17 cm, 14 cm, and 16 cm at the primary data and secondary data on 9 cm are processed using the admiralty method. The value of the processed using least square method obtained 40 M2 results cm, 39 cm, 41 cm at 40 cm in the primary data secondary data and the value of S2 17 cm, 18 cm, 16 cm in the primary data secondary data 19 cm. The value of the number of the primary data Formzhal and secondary data has a value of 0.25 < < F 1.50 showed daily double type of leaning the mixture. Least square method has a more accurate values compared to the admiralty method. RMS error of least square method in 0.0058 and 0.1992 on admiralty method Keywords: harmonic components of M2 and S2, the type of ups and downs, the admiralty and the least square method

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