The Trimble Navigation is a company giving advanced positioning solutions, is the most renowned for its GPS receivers, range finders and inertial navigation systems. Files having the POS extension are files containing text descriptions of a point developed by Trimble Navigation for Global Positioning System receivers or simply known as GPS devices. A POS file has an ID and go after by one or additional locations, in longitude and latitude, per ID, and also it sets proficiently by giving a list that shows the different coordinates that describe the point of source defined in a corresponding ATT file. In order to access and view files in the POS format, users may have to set up the needed programs such as Trimble Navigation GPD Pathfinder Office or My Topo POS2MXF. In case that some of these programs will not be available on the users’ system, converting the file to another format to make it work.