Abstract: “In shipping industry where large fleet of vehicles were spread out over the vast expanses of ocean, the owner corporations often found it difficult to keep track of what was happening. As necessity is the mother of invention, so GPS tracking systems which originally were used in military operations found their application here. Now the commercial application grew popular for the all sorts of consumer’s vehicle, using tracking systems to prevent theft and enhance retrieval. GPS (Global Positionin”

Keywords: Active & Passive tracking ,GPS system, triangulation, trilateration.