The air cells of a jacket-style buoyancy compensator make it easier to maintain:

The air cells of a jacket-style buoyancy compensator are designed primarily to assist divers in maintaining a vertical body position while on the surface. This style of buoyancy compensator wraps around the body and provides lift at the shoulders and upper torso, allowing the diver to float in a more upright position. This design is particularly beneficial when a diver is at the surface, enabling them to relax and stay buoyant without expending energy.

While the jacket-style buoyancy compensator can contribute to horizontal positioning underwater, its main function is to support the head and upper body when floating on the surface. This characteristic differentiates it from other buoyancy systems that may focus more on horizontal positioning or stabilization at various depths. Understanding the specific design and purpose of jacket-style buoyancy compensators is key to utilizing them effectively in diving scenarios.