If you have a cabin...you can apply for the license number ending with 6 instead of 8. It means that you can sail outside Hong Kong, ie offshore. My boat is built with a cabin..it is right that we seldom using it...only for storage of goods. However, with this cabin, I could sail to Macau two years ago. Whislt I encountered with a thunderstorm durng the return trip, I and my son stayed inside the cabin for 45 mins with full protection from bad weathers