Thunderbolt Marine Inc. is a full service yacht repair and refit facility with a marina located twelve miles up the Wilmington River in Thunderbolt, Georgia, just outside the city limits of Historic Savannah. TMI is on the Intracoastal Waterway at Marker #35 (ICW Mile #583). The relative quiet of this small town, the beauty of the marsh, and the mild year-round temperatures make it an attractive destination for the discerning yachtsman. VHF Channel 16, working channel:11 Marina does not have dry storage.

TMI is an easy approach either through Wassaw Sound (with no overhead height restrictions) and up the Wilmington River or through Savannah River entrance and down the ICW (65ft overhead height restriction). There is a mean river depth at low water of 12ft (3.7m). The basin in the yard is dredged to 14ft (4.3m), has ample room to maneuver and can accommodate vessels up to 200ft in length.