As mentioned, it's impossible to make a simple PC game fully realistic. It's really up to the gamer himself on how "realistic" he/she wants to make the game. i.e. 100% settings, external view/cameras on or off etc. Some elements are simply left to the imagination.
For what it's worth, I find SH4 Speech to be another way to add a touch of "realism" and/or immersion. Saying "Come left 45 degrees" into my headset microphone and hearing the response "Aye, aye sir, new course xxx degrees" is kinda cool. Fortunately there's noone else in the house to hear me apparently speaking/yelling to myself, LOL.
