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.
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.