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Description: Chipset: 8th Size: 38*49*16mm Cable Length: 2 meters Inside LNA signal amplifier Support GPS + GLONASS(default), GPS + beidou, GLONASS + beidou Build-in Flash 1-10Hz Positioning update rate Frequency: L1, 1575.42MHz Baud rate: 4800, 9600, 19200,38400,57600, 115200bps Channel: 72 Highest: 50000 meters Maximum speed: 500m/s Operating temperature: -40 to 85 Celsius Cold start: average 29 seconds Warm start: average 28 seconds Hot start: average 1 second Applications: bus station, car navigation, computer navigation, boat navigation Package Includes: 1 * vk-162 USB GPS This usb gps can be used for mac computer, but it requires very professional technical skills. If you are not good at it, please don't buy it. Here is document link: http://www.ybw.com/forums/showthread.php?455598-I-ve-found-a-cheap-USB-GPS-dongle-which-works-with-OpenCPN-on-Mac-OS-X How to use on mac: https://tinyurl.com/gps-works-on-mac .