The establishment of a GPS Permanent Station network in Indonesia began in 1996, and is now known as Indonesia continuously operating reference station (INA-CORS), its management authority under the Geospatial Information Agency (BIG). Based on information from BIG, data of 2016, the distribution of CORS in Indonesia has as many as 135 stations. INA-CORS is built, has the main objective is to maintain national geodetic reference frames in active seismic zones for survey and mapping purposes, as well as basic tasks and BIG functions. In its development, based on (BEVIS 1992) RINEX data is not only to determine the position as a reference geodesy for survey and mapping, but also to determine the water vapor for meteorological purposes. The observational accuracy is similar to the results obtained from other methods. Water vapor plays an important role in the atmospheric system because it affects the balance of elements and energy in space, so it is worth developing.