The Shearwater Swift GPS is a wireless air integrated transmitter that gives compatible Shearwater dive computers real-time tank pressure data while also capturing your dive entry and exit coordinates for your dive log. When synced with Dive Shearwater, your log can display mapped dive locations, entry and exit points, and location names when available. It also features Shearwater’s advanced collision avoidance system for reliable use around other transmitters and a user-replaceable CR2 battery. The Swift GPS is compatible with all current Shearwater air integrated dive computers. GPS location capture works at the surface, not underwater.