#Uputronics GPS Expansion Board Adds location and PPS to enable precision time keeping to your Raspberry Pi. Features: * 166 dBm sensitivity, 18Hz update rate, 72 channel * Supports up to 3 concurrent GNSS sources GPS (American) GALILEO (European) Glonass (Russian) QZSS (Japan) and BeiDou (China) * PPS Output on fix (programmable 0.25Hz -> 10MHz) * LED indicator on PPS * Altitude limit 50km in flight mode * Robust SMA connector for external antenna * Current draw 6mA in cyclic mode up to 18mA in acquire. I2C is connected but uses clock stretching. Command reference guide: U-Blox M8 Reciever Description