What is the primary purpose of a surface signal device?

The primary purpose of a surface signal device is to communicate with surface support or alert for distress. These devices, such as flags, whistles, or inflatable markers, are crucial for divers to signal their presence on the surface and notify boaters or other divers if assistance is needed. Effective communication with surface support enhances safety and ensures that divers can be located quickly in emergencies or situations where visibility is compromised.

While keeping warm, assisting in underwater navigation, and tracking dive time are important aspects of diving, they do not align with the primary function of a surface signal device. Such devices are specifically designed to attract attention and provide a means of signaling to those who are not underwater, which is vital for the diver's safety and overall diving experience.