Below is a link to an extract of the DES Ships Maritime Systems Handbook. It covers ‘What is a Combat System' and ‘The Systems of Systems Approach’. It also includes descriptions of various surface platforms and how a typical ship's company is structured.
The Royal Navy website is also a useful resource; of particular note would be the links to the Surface and Submarine fleets.
Finally a video has been produced by Fleet Operational Sea Training. It shows how competencies are tested at sea. Of particular note is how they assess Combat System competence.
Naval Combat Systems Engineering 2014/15
'This Fleet Operation Sea Training (FOST) video gives an indication of how ships companies are checked to ensure they are fully trained and ready to be deployed. It shows all aspects of the competencies expected on board, but it is particularly worth noting how they check Combat System competence.'