Yes the three week course still holds good for a first mates, check with the collage to see if you need any other certs - firefighting, survival craft and the like -. If your thinking about going back then there seems to be plenty of jobs out there.
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It sounds as though your ticket is of the old pre STCW type. This is no bad thing but if you havn't been on merchant ships for more than 5 years it will need revalidating. That involves a three week couse (I recomend Liverpoor John Moors Uni). Then it needs an up to date medical cert and that...