NMEA 0183 is a standard that allows different type equipment from diferent manufacturers to talk to each other. Examples are a GPS system sending position, course and speed data to a radar system which needs that info to determine if a collision is possible with a target, also sending the data to a VHF radio system so that if a distress call is made the vessel position is embedded in the call. Or a wind sensor system sending direction and speed data to a chart plotter so it can be displayed...etc. It is a standard which defines the word, sentences and structure of the data messages so everyone can play nice together.
RSView in an Allen-Bradley HMI product for PLC controlled systems - HMI being the actual touch screens, graphics, sounds, etc from the operator console. While a PLC does the actual control and monitoring various of items (generically called I/O - for Input/Output) the PLC from the shelf has to have a control program written for it (RSLogix would be an example of a tool for that) and then it has to be provided a way to communicate with the operator - screen and graphics development, etc.
The advantage of RSView is that an HMI application can be developed in it and run and many different manufacturers PLC's - not limited to only systems using Allen-Bradley PLC's.
EW would by neccessity be versed in both the 0183 standar and have the capability to develop HMI in RSView - whether either is used on any given contract/solution is another topic altogether.
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