There are ONLY 2 ways travellimg from shore to a vessel offshore. It is either by chopper (aka helicopter) or by boat (crew boat)
CHOPPER
Advantages:
Quick/Faster
Disadvantages:
Risky
Baggage Limitation
Seat Limitation
No Toilet break
CREW BOAT
Advantages:
Less Risky – higher chance of survival in a mishap
No Baggage Limitation
No Seat Limitation
Disadvantages:
Slow
Sea Sickness