satelit of altimentry is an experiment satellite concerning topography ocean surface that be launched witha purpose in order to studying and mapping of ocean surface circulation. primary system navigation subsystem satellite of altimentry ropex/posedoin is established and maintaned a pre-designed reference orbit. and in order to measuring, monitoring, and predicting the satellite ground tack continuously. this paper describes application and function satellite of altimetry topex/poseidon with ne navigation subsystem to establish and measure of mapping sea level from space as sea region security.