For maritime applications, eLoran is considered as the most promising backup for Global Navigation Satellite System in case the use of navigation satellite signals is denied. We present a proposal study to establish eLoran navigation system for Egyptian maritime harbors to act as a national and international backup to GPS for maritime navigation, and other user sectors using MATLAB. The purpose of the Egyptian eLoran system is providing performance requirements for maritime Harbor Entrance Approach (HEA) on all Egyptian harbors. Accuracy, integrity, continuity and availability are the most interested requirements for HEA. The required levels of Integrity as a requirement of the International Maritime Organization had been verified over all the Egyptian harbors.