@ManDontCry & vincentlwsYes, I was working on seismic vessels before this. I am still in the O&G field though.
Dont worry ManDontCry, your degree is good enough to land you a job in the field you are looking at. However, you will still need to go through rounds of interviews and an above average results will always be preferred by those large organisations.
About the 10 years of offshore working experience. It is good to set a number of years to be in the field before settling down. You might get married or you might have some other commitments which off course, makes it hard for you to leave for offshore duty. Usually, a person might work for 7 or 8 years (some maybe 5) *depends on individuals* and they go into managements. You can become a project manager or a consultant depending on what you prefer and the opportunities provided. You can also end up as a sales engineer for the company where you represent the company to deal with customers especially in the technical issues since you have the experience and the knowledge. Off coz, if you like the job, you can continue working offshore. I have seen a person still working offshore at an age of 63.
Another issue that I think you have to consider is, the offshore period might be as short as 1 week to a length of 3 months. So, I think it is wise to say that you might be away offshore an average of 2 months before you can return home for a short break (2 weeks maybe). So, be prepared to miss any celebrations, birthday parties, and you will definitely miss your girlfriend a lot