If you already have a 100 ton n/c why focus on tugs? You will have to start at the bottom and work your way up through apprentice mate then steersman. There are times I wish I had gone inshore, but remember you have the credentials to run quite a few vessels in the GoM for example. Right now i run a 170’ DP1 boat and its classed at 90 GRT. However most offshore boat work is 28/14…