Somers Isles Shipping Ltd. (SISL) commenced operations in July 1985 offering a direct service between Jacksonville, Florida and Hamilton, Bermuda. The first few voyages were operated with the vessel ‘Clifford R. Simmons’ but in August 1985 it was replaced by the time chartered ‘Somers Isles’ and the fifth vessel of this name is now in service. In 1986, the U.S. port was changed to Fernandina Beach, Florida which is approximately 40 miles north of Jacksonville. The ‘Somers Isles’ was the first vessel to call at the Forest Products Terminal operated by Nassau Terminals Inc. in Fernandina Beach.

The service schedule operated by SISL provides two direct voyages every three weeks. The three weekly rotations commences with a sailing from Fernandina Beach on a Friday arriving in Bermuda the following Tuesday morning and departing Bermuda Wednesday morning. The next sailing from Fernandina Beach is the following Saturday; arriving in Bermuda the next Wednesday and remaining there until the Friday, at which time it heads back to Fernandina Beach to begin the cycle again. This service schedule provides 34 to 35 round trip voyages per year with a port-to-port transit time of three and a half days. The distance, port-to-port, between Fernandina Beach and Hamilton, Bermuda is 880 nautical miles. As of the end of December 2014, SISL had provided 1,007 round trip voyages between Florida and Bermuda.

The SISL service is primarily a one-way trade with the cargo flowing from the US to Bermuda; in 2014 98% of cargo volume was carried on the eastbound leg with the westbound leg carrying primarily empty containers. The type of cargo carried covers the whole range of consumer goods, foodstuffs, other essentials and construction material as nearly everything that is consumed and used in Bermuda is imported. Some break bulk cargo is carried on the service; about 5% of volume in 2014 was break bulk and comprised mainly building material, boats and vehicles. The container traffic is nearly all twenty-foot units as the restricted road system in Bermuda will not allow forty-foot containers to be landed, except in very special circumstances.