Canmore GT-740FL Sport GPS Data Logger with arm band (SiRF IV chipset, G-Sensor, 256K waypoints, IPX 6 water resistant, 15g only) 48 track verification channels Stores up to 256,000 data records Super light! Weighs only half an ounce including the battery Operates in temperatures as low as -40 F and as high as 185 F! Compatible with Google Earth