# CUAV C-RTK
The CUAV C-RTK GPS receiver (opens new window) is an RTK GPS module for the mass market. 一个完整的RTK 系统由至少两个 c-rtk 模块 组成(一个用于基站, 另外一个作为移动站用于飞机上)。 使用RTK，PX4控制器可以获取到它的位置，并且这个位置的精度可以达到厘米级的精度，这比普通GPS提供的位置更加精确。
# Where to Buy
- cuav淘宝店铺 (opens new window)
- [cuav aliexpress](https://www.aliexpress.com/store/product/CUAV-NEW-Flight-Controller-GPS-C-RTK-differential-positioning-navigation-module-GPS-for-PIX4-Pixhawk-pixhack/3257035_32853894248.html?spm=2114.12010608.0.0.75592fadQKPPEn
Context)
# 配置
RTK setup and use on PX4 via QGroundControl is largely plug and play (see RTK GPS for more information).
# 接线和连接
C-RTK GPS comes with a cable that terminates in a 6-pin connector and 4-pin connector that are compatible with Pixhack v3 (opens new window). 6针连接器提供 rtk gps 的接口, 并应连接到飞行控制器的 gps 接口。 4针连接器是一个 m8n (标准) gps 接口, 可作为第二个 gps(可选)。
提示
At time of writing PX4 does not yet fully support a second GPS. The 4-pin port need not be connected.
The cables/connectors may need to be modified in order to connect to other flight controller boards. The pin mappings for Pixhawk 3 Pro and Pixracer are shown below.
# 针脚定义
The C-RTK GPS pinout is provided below. This can be used to help modify the connector for other autopilot boards.
| 引脚 | C-RTK GPS 6P | 引脚 | Pixhawk 3 Pro GPS | C-RTK GPS 4P |
|---|---|---|---|---|
| 1 | SDA | 1 | VCC | |
| 2 | SCL | 2 | GPS_TX | |
| 3 | GPS_RX | 3 | GPS_RX | GPS_RX |
| 4 | GPS_TX | 4 | SCL | GPS_TX |
| 5 | VCC_5V | 5 | SDA | VCC_5V |
| 6 | GND | 6 | GND | GND |