Abstract. Measurement of the geomagnetic field in Indonesia is undertaken by Meteorological, Climatological, and Geophysical Agency (BMKG). Routine activities at each observatory include determination declination, inclination, total using absolute variation measurements. The oldest Tangerang (TNG), started 1957, followed Tuntungan (TUN) 1980, Tondano (TND) 1990, Pelabuhan Ratu (PLR) Kupang (KPG...
