Tax and marinas
1) The 179 day rule does NOT apply to SC state residents; ONLY for non residents whose boats are in SC waters for > 179 days. You may know this already but others seem to be confused.
2) The Charleston marinas I know have limited live aboard slips particularly for rented slips. Currently, at Ashley marina for example, only slip OWNERS can live aboard. Renters cannot. I recall 2 weeks/month is the cut point for the designation but a phone call would clarify.