diff --git a/docs/en/unit/gps.md b/docs/en/unit/gps.md
index e33fef64..be5f9234 100644
--- a/docs/en/unit/gps.md
+++ b/docs/en/unit/gps.md
@@ -1,4 +1,4 @@
-# GPS {docsify-ignore-all}
+# Unit GPS {docsify-ignore-all}
@@ -6,21 +6,40 @@
:memo:**[Description](#Description)** :octocat:**[Example](#Example)** 🛒**[Purchase](https://pt.aliexpress.com/store/product/M5Stack-Official-GPS-BDS-Mini-Unit-Board-AT6558-MAX2659-with-GROVE-Port-UART-Interface-M5GO-M5Stack/3226069_32959837627.html?spm=a2g03.12010615.8148356.4.d2df160dp0aQSw)**
-
-
## Description
-**GPS**with **AT6558** inside which is created and developed by a Chinese Company named Zhongkewei. AT6558 is capable of highly performance,supportting many types of satellite navigation system. It is capable of receiving GNSS signal from 6 satellite navigation system, and capable of joint location ,navigation,and timing . Therefore the module is able to obtain accurate global location information . You can connect it to M5Core port C with GROVE cable, and develope it with UART communication. Regards to the gps Unit , a signal amplifying chip is **MAX2659** integrated inside .
+**GPS** is a Unit that integrates the Zhongke Weibeidou navigation chip AT6558 and the signal amplification chip MAX2659. AT6558 is capable of highly performance,supportting many types of satellite navigation system. It can receive satellite signals on 56 channels. It is capable of receiving GNSS signal from 6 satellite navigation system, and capable of joint location, navigation, and timing. Therefore the module is able to obtain accurate global location information. The AT6558 can be positioned quickly and accurately anywhere in the city, in the canyon, under the overhead, and at any location inside the car. The module can be widely used in vehicle monitoring, bus reporting, car navigation, onboard navigation, notebook navigation and other products.
+
+Regards to the gps Unit , a signal amplifying chip is **MAX2659** integrated inside.
+
+You can connect it to M5Core port C with GROVE cable, and develope it with UART communication.
+
+The parameter of UART: Baudrate(**default: 9600bps**), Start bits(1 bit), Stop bits(1 bit), Parity(no)
## Feature
-- Supportting many types of satellite navigation system, China BDS , USA GPS, and Russia GLONASS etc
-- AT6558
- - 15mA Ultra low power comsume
- - integrated radio frequency,base band, flash
- - working temperature:-40~85℃
-
-- With two Lego plugin holes on the Unit, it could be more easier to compatable with Lego mountings
+- Functional specification
+ - Positioning accuracy: 2.5 meters (CEP50, open space)
+ - Channel: 56
+ - Support single system positioning of BDS/GPS/GLONASS satellite navigation systems, or multi-system joint positioning in any combination
+ - Support D-GNSS differential positioning
+ - Positioning update frequency: 1-10Hz
+ - Maximum height: 1800 m
+ - Maximum speed: 515 m/s
+ - Maximum acceleration: <= 4 G
+- Low power consumption
+ - BDS/GPS dual mode continuous operation: <23mA (@3.3V)
+ - Standby: <10uA (@3.3V)
+- Sensitivity
+ - Tracking: -162dBm
+ - Capture: -148dBm
+ - Cold start: -146dBm
+- Start Time
+ - Cold start: 35 seconds
+ - Warm start: 32 seconds
+ - Hot start: 1 second
+- Operating temperature: -40~85°C
+- Two Lego installation holes
## Include
@@ -29,8 +48,9 @@
## Application
-- Vehicle location
-- Intelligent Law enforcement location
+- Car, ship positioning and navigation
+- High precision timing
+- Intelligent law enforcement positioning
## Related Link
@@ -48,7 +68,7 @@
## Example
-### 1. Arduino IDE
+### Arduino IDE
*If you want the complete code `GPSRaw.ino`, please click [here](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Unit/GPS/Arduino).*
@@ -82,16 +102,30 @@ void loop() {
After burnt the example code `GPSRaw.ino`, m5core and PC serial terminal will display following information
```
-$GPGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5*02
-$BDGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5*13
-$GPGSV,1,1,00*79
-$BDGSV,1,1,00*68
-$GNRMC,,V,,,,,,,,,,M*4E
-$GNVTG,,,,,,,,,M*2D
-$GNZDA,,,,,,*56
+$GNGGA,063012.000,2234.87140,N,11357.22414,E,1,06,4.2,7.3,M,0.0,M,,*7D
+$GNGLL,2234.87140,N,11357.22414,E,063012.000,A,A*4C
+$GPGSA,A,3,01,09,11,18,23,,,,,,,,6.3,4.2,4.7*32
+$BDGSA,A,3,13,,,,,,,,,,,,6.3,4.2,4.7*21
+$GPGSV,3,1,10,01,54,164,33,04,,,22,08,46,019,,09,23,230,24*40
+$GPGSV,3,2,10,11,81,200,12,18,65,110,26,23,14,195,25,27,18,041,*78
+$GPGSV,3,3,10,28,10,300,15,30,33,319,*7C
+$BDGSV,1,1,01,13,43,195,29*5A
+$GNRMC,063012.000,A,2234.87140,N,11357.22414,E,0.69,171.74,240419,,,A*7A
+$GNVTG,171.74,T,,M,0.69,N,1.27,K,A*2C
+$GNZDA,063012.000,24,04,2019,00,00*46
$GPTXT,01,01,01,ANTENNA OPEN*25
```
+**Analysis:**
+
+**$GNRMC,063012.000,A,2234.87140,N,11357.22414,E,0.69,171.74,240419,,,A*7A**
+
+Indicates that the positioning information is UTC time is 06:30:12, north latitude 22.58119°, east longitude 113.95357°, date is April 24, 2019
+
+
+
+
+
## Schematic
