This paper investigates the determinants of Computerized System for Execution of Martime Security systems at Mombasa port, Kenya:-In particular to establish the effect of Under Water Detection System-Band Radar and Vessel Monitoring system on the Maritime Security Systems. Data was analyzed by: Regression analysis, Structure Equation Modeling; Methods employed were standardized regression coefficient, Variance errors and Covariance. The finding is that: Under Water Detection system had β=0.342, with Ratio Index (2.557); X-Band Radar (β.170) which was low, hence X-Band Radar indicated a weak predictor. Vessel monitoring system had Ratio Index (3.557); Lastly Model_4 (Under water Detection System) had Ratio Index (4.7537). Insecurity and coastline surveillance systems are still wanting; the maritime security of the Western Indian Ocean has also undergone a transformation. Maritime security at Mombasa port is of international importance due to high level of trade routed via the sea; All the same, Kenya has a renewed focus on maritime affairs; the security has also undergone a transformation at Mombasa. Further investigation on proper use of Vessel Monitoring system and X-Band Radar System is required; Installations of more repeaters, access points, setting up demilitarized zones are paramount. The country need to invest in Security; Reinforcement of coastline surveillance systems to improve strong hold of its coast water security, lastly to attract more international coalitions and partnerships for fighting against Maritime insecurity at Mombasa port.