Where to register depends.
1. Will you be keeping a shoreside address?
2. Where will the
boat be docked/moored/anchored, especially for the first 90 days and first 12 months?
3. If you don't plan to keep the
boat in Charleston, how long will it stay there before you move it?
4. What are your reasons for asking which state:
a. most convenient place for you for to get mail, long term residence, voting, other daily living issues.
b. minimize your sales and use tax expense?
c. minimize your future possible tax exposure?
d. other?