Please keep the ceramic antenna clear and avoid dose to metal and carbon fiber, For best reception, please use a bracket to install the GN$S antenna in a clear place. And as far away from the VTX and R/C receiver antennas as possible. The electronic compass is a magnetically sensitive device, Please keep it away from ferromagnetic objects when installing it. When connecting to the fc, please connect the RX of the GNSS module to the TX of the fc, and the TX of the module to the RX of the fc. lfneed to use the compass, please connect $CL/SDA to the 12C interface of the fc. Receiving frequency band: GPSL1,GLONASSL1,BDS B1, E1, SBAS L1,QZSS L1 Receiving channel: 72CH Output protocol: UBLOX/NMEA Output refresh rate: 1HZ-10Hz Speed accuracy: 0.05m/s Maximum working height: 50000m Size: 25x25x4.8mm Receiving sensitivity:- 162dBm Baud rate: 115200dps Power input: 5V30mA Positioning accuracy: 2D ACC1.5m Maximum moving speed: 500m/s Weight: 6.9g The product appearance and printed words depending on the batch, but this does not affect use. Colour:As Shown Material:PCB Package Contents: 1 * GNSS Pro Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.