Offshore & maritime crew requirements, explained by who requires them.
STCW, IMO's Mobile Offshore Unit framework, flag states, coastal states, industry standards and employers are seven different systems. This site keeps them separate — so a Driller is never quietly turned into an Able Seaman, and an OIM is never quietly turned into a Master.
One offshore installation. Several regulatory systems.
Every badge on this site answers "who requires this" before it answers "what's required." Click any tile for the full picture.
What applies to me?
Pick where you work and what kind of personnel you are. This shows likely applicable frameworks — never a definitive eligibility statement. For a specific answer, use the Role Explorer or your unit's Minimum Safe Manning Certificate.
Step 1 — Where do you work?
Step 2 — What type of personnel are you?
Misleading equivalencies
"OIM = Master." "Barge Master = Chief Officer." These comparisons circulate constantly in offshore career content. Here's what the primary sources actually establish.
Where to go next
Installation Types
Drillship, semi-sub, jack-up, FPSO, fixed platform — what regime applies to each.
Explore installations →Offshore Roles
OIM, Barge Supervisor, DPO, Driller, Toolpusher and 20+ more — role by role.
Explore roles →Flag States
Liberia and Marshall Islands, with explicit source-currency warnings.
Explore flag states →