It is possibly a shipping company, as several containers are seen in the Port of Los Santos. The company also owns a small office building on Paleto Boulevard in Paleto Bay and manages a warehouse in the LSIA area.
Shipping Containers sporting the Jetsam logo can also be found in Grand Theft Auto IV at Port Tudor, Normandy and East Hook. In Grand Theft Auto V, there is a unique Cargobob with Jetsam livery, named Cargobob Jetsam.
It can be assumed that Jetsam includes transport of hazardous chemicals as there is a sign in front of the terminal that reads: "This facility contains chemicals known to the state of Los Santos to cause cancer, birth defects or other reproductive harm". That same sign claims that Los Santos is a state, while in-game, San Andreas is the state, and Los Santos is just a major city. This is probably a mistake/oversight by the game's texture artists.
- In maritime law, Jetsam refers to parts of a ship, its equipment, or its cargo which is purposefully thrown overboard to lighten the ship's load, and which then washes ashore.