пример, как британцы классифицируют некоторые типы судов:
The code requirements are divided into six main categories depending on the type and use of your vessel.
Cat 0: unrestricted service.
Cat 1: up to 150 miles from a safe haven.
Cat 2: up to 60 miles from a safe haven.
Cat 3: up to 20 miles from a safe haven.
Cat 4: up to 20 miles from a safe haven, in favourable weather & daylight.
Cat 5: up to 20 miles from a nominated departure point, in favourable weather & daylight.
применительно к зап. чястям без понятия, возможно "неограниченные условия эксплуатации" ...