Seek advice for Carreer change

I am 49 years old college grad. with a Mech. Engineering Technology Degree, that is married with 2 young kids. I am tired of the lay-off and broken the promise of the Mechanical Engineering.
I want a career with steady work and being able to move up. An opportunity came to that would allow me to become a merchant marine.
What scares me, my mentor stated who is a Navy Merchant Marine that “90% of the people he knows are divorced, single and the average time for deployment 8 mo”. I hope this will not lead towards a divorce if I decide to do this.
What other short term deployments are there? Hope is the Gulf and Great lakes. What vessels are ideal for families? Do spouse flies their spouse to port?