Add-on GPS Expansion Board Navigation Positioning Module V3 For Raspberry Pi 2Description:This is an GPS expansion board designed specifically for the both the version 1 and version 2 Raspberry Pi+ Models (This board is NOT compatible with the original Raspberry Pi A and B boards).This board is designed for applications that use a GPS connected via the serial ports to the Raspberry Pi such as timing applications or general applications that require GPS information.To facilitate PPS the time pulse output is connected to GPIO5 so you can utilise this board to give NTP PPS discipline.This board is equipped with the latest Ublox NEO-6M\/NEO-M8N positioning module.Feature:161dBm sensitivity、 Update rate up to 5Hz、 50 channels (NEO-6M)Only 30mA current draw (NEO-6M)167dBm sensitivity、 Single GNSS update rate up to 18Hz、 Concureent GNSS update rate up to 10hz、72 channels support NASS、BEIDOU2、SBAS(NEO-M8N)Built in Real Time Clock (RTC) - XH414H-IV01E backup battery for more of time keeping even if the Pi is off!PPS output on fix、 by default connected to pinGPIO5.Internal patch antenna which works quite well when used outdoors + uFL connector and SMA connector for external active antenna for when used indoors or in locations without a clear sky view.Fix status LED blinks to let you know when the GPS has determined the current coordinate.Pinouts2x20 way header is supplied and 2 suitable standoffs providing a very robust solution . The board follows Raspberry Pi's HAT physical layout with camera and display port notches. It is possible to stack additional HAT's on top of this board with a suitable header. This HAT takes over the Pi's hardware UART to send\/receive data to and from the GPS module. So、 if you need to use the RX\/TX pins with a console cable、 you cannot also use this HAT.Serial Console PinsThe Raspberry Pi has only one serial port、 and you do need serial to chat to a GPS so we will take over the RXD and TXD pins.PPS PinGPS's can output a 'pulse per second' for synchronizing the time. We have a breakout for this and a closed jumper that connects it to GPIO5.CompassThe HMC5883L is a 3 axis digital compass which can communicate via I2C to the Raspberry Pi using only 2 data lines.External AntennaAll Ultimate GPS modules have a built in patch antenna - this antenna provides -162 dBm(NEO-6M) or -167 dBm(NEO-M8n)sensitivity and is perfect for many projects. However、 if you want to place your project in a box、 it might not be possible to have the antenna pointing up、 or it might be in a metal shield、 or you may need more sensitivity. In these cases、 you may want to use an external active antenna.GPS antennas use SMA connectors or uFL->SMA adapter cable.Then connect the GPS antenna to the cable.The uFL cable and The SMA connectors.Package includes:1 x GPS Module1 x Antenna (Cable: 290cm)