SMBs are used to signal a diver's location to boats or other surface support. They are inflated with air from a dive regulator and float on the water’s surface, providing a visible marker for surface vessels. SMBs come in various sizes and designs, including those with integrated lights or reflective materials for increased visibility. Proper deployment and retrieval techniques are crucial for safety and efficiency. Regular inspection and maintenance ensure that the SMB remains in good working condition and is ready for use when needed.