Casio G-Shock GWF-1000-1JF Frogman Depth Sensor

Construction
Shock-resistant
Water Resistance
ISO 200-meter water resistance
Radio Frequency
77.5 kHz (DCF77: Germany); 60 kHz (MSF: UK); 60 kHz (WWVB: USA); 40 kHz (JJY: Fukushima, Japan) / 60 kHz (JJY: Kyushu, Japan); 68.5 kHz (BPC: China)
Radio Wave Reception
Automatic reception up to six times a day (except for use in China: up to five times a day); manual reception
Diving Functions
Measuring range: 0 m to 80 m (252.5 ft.); measuring unit: 0.1 m (0.5 ft.); dive time measurement up to 6 hours (1-second intervals up to 180 minutes, 1-minute intervals after 180 minutes); automatic measurement start/stop at depth of 1.5 meters (5 ft.) and automatic log memory in Diving Mode; surface interval time display (max. 48 hours); excessive ascent rate alarm
Log Data
Records 20 diving logs (including dive start time, dive time, maximum depth, and lowest water temperature)
Digital Compass
0359 degree compass bearing measurement, direction displayed as one of 16 points (no display in Diving Mode), 60 seconds continuous measurement (20 seconds in Diving Mode), North-South-West-East graphic display, bearing memory, auto horizontal compensation, bidirectional calibration, magnetic declination correction
Thermometer
Measuring range: 10 to 60C (14 to 140F); measuring unit: 0.1C
Time Stamp
Records 20 date and time sets (also records water depth and temperature bearing during water depth measurement, bearing during compass bearing measurement, and temperature during temperature measurement)