There is very little correlation between his Navy officer billet and a civilian career if he's going in as an Unrestricted Line Officer. It's relatively the same story for Restricted Line Officers and Limited Duty Officers (LDO), with exceptions... One of the many "engineering titles" within the restricted line duties may serve him well upon discharge (Nuclear Power School Instructors, Naval Reactor Engineer, Engineering Duty Officers, Aerospace Engineering Duty Officers, Meteorology/Oceanography Officers, Information Warfare Officers, Cyber Warfare Engineers, etc). These are highly specialized, technical positions and are given the title of Restricted Line because they only hold command billets in their specialized fields, so you can see they MIGHT translate well into a civilian career. Mind you, that's a big "if;" most of these positions are exclusive to the United States Navy and the real civilian industry that corresponds (roughly) to these titles doesn't work the same way. Staff Corps officers hold most of the professional positions: doctors, dentists, chaplains, lawyers, etc... These officers pretty much know where they're headed after they leave.
This is much the same issue within any branch of the military. What post-Army career fits best for an 11B? Security guard? Private Military Contractor? Some of the best case scenarios I've seen are medical staff who go on to continue within medicine when they leave. For example, AIT (MOS school) and A-school for an Army 68W and a Navy Hospital Corpsman, respectively, leave them a few credits short of an EMT certification in most states (maybe even grant them with the certification while in job school. I'm not sure). Much of the key to ensuring a good post-military career is writing the right kind of résumé. Instead of explicitly stating that you were a Surface Warfare Officer for four years, you should explain how the multiple command billets you held and your leadership responsibilities contribute well to your candidacy for employment. There are exceptions out there. The recent director of that cop movie, End of Watch, was a Navy veteran... I remember reading an article about an Intelligence Officer from the Navy who works in Washington now... Various success stories here and there. Most of the success has little to do (at least directly) with their former military job titles and careers, although some really do branch off to work within the same field (most of them Federal employees, a few within the FBI, etc). Police precincts love to employ veterans. It's a general rule that you shouldn't go into the military expecting it to prepare you for a stable civilian career.
If your son really does go into aviation and contemplates flying for a commercial airline, that's great. Otherwise, it's hard to predict how his Navy career will determine his post-discharge career. I'd say his most important and logical step after leaving is to utilize his GI Bill (given he's eligible) to enroll back in school and work towards his next degree (probably a Master's given the fact he's going in with a Bachelor's). Good luck!