I previously served at sea on cargo ships as a Navigational Officer AMA!
I served as a Junior Officer until recently. I'm no longer at sea due to medical reasons.
People often seem interested by what I do, or did rather.
EDIT: I need to go out for a few hours. I will answer all questions when I get back around 2300 CET. I will try and answer as many as I can while I am out.
EDIT: I'm back, will start your questions now!