The GWN-Q1000, is the latest addition to G-Shock´s ocean concept GULFMASTER Series. This is the first G-Shock to have a water depth sensor, it also has sensors to track ocean conditions (aiming to assist coast guard officers and others in security and rescue activities at sea), a temperature sensor that reads changes in air and water temperature, and a compass bearing sensor that helps detect wind and tidal direction. In fact, the high-tech Quad Sensor tracks constantly changing ocean conditions, making it perfect for coast guard officers and others who are active at sea. Its water rated to 200m and built to withstand the harshest of conditions, it even has carbon fibre in its construction to fend off the destructive effects of salt water.