Geodesy one of his most important tasks is natural and artificial on the physical earth it is to produce three-dimensional positional information of details. Position on Earth horizontal and vertical checkpoints whose information has already been established and Global Navigation Satellite System (GNSS) Networks. End while the use of GNSS recipients in the years to produce location information it is widespread. However, the height obtained from GNSS systems to reference ellipsoids along the nucleus curve of the measured point it is the ellipsoidal elevation (h) which refers to its distance. Elipsoidal altitude it is a geometric value and has no physical equivalent, therefore it is fact it does not mean a height in sense. Therefore, our engineering problems orthometric heights (h) for elipsoidal heights for solution (H) it needs to be converted. Orthometric height, one on the ground it is the distance of the point to the geoid surface along the nucleus curve. Active GNSS it is designated for its use with a sensitive vertical control network and centimetre precision geoid surface is needed. To create a sensitive geoid surface, first of all, the creation of a sensitive Nivelman network in international standards, performing sufficient gravite measurements from mareograph stations obtaining average sea level data and balancing the measurements it is necessary. Known ongoing road expansion, such as our current vertical control network of our country (TUDKA) it was largely destroyed by its work and infrastructure work. Additionally, the vulnerability of geoit surfaces obtained from this network, but ©10 around centimeters. Consequently, we need to renew our DKA he's out. Therefore, the US Federal Geodetic Control Committee (FGCC) 2nd Class 1 carried out in the framework of its standards from the national vertical control network of international and national DKAs issues to be taken care of in carrying out the facility and the Nivelman measurements explained.