Update README.md

README.md

@@ -6,38 +6,14 @@ There are people who buy boats but there are also people who build them, why not
 
 ## Features
 
-* **Chartplotter**. With [OpenCPN](http://opencpn.org), a navigation software with useful plugins.
-* **Weather Forecast**. Download and visualize GRIB files with [zyGrib](http://www.zygrib.org).
-* **NMEA 0183 Multiplexer**. Multiplex and filter data inputs from any number of serial and network interfaces. Send and filter to any number of outputs.
-* **Signal K (beta)**. OpenPlotter is ready for [Signal K](http://signalk.org/), the new, free and open source universal marine data exchange.
-* **Inspector**. Check the data traffic to avoid conflicts and overlaps between sources.
-* **WiFi Access Point**. Share data (NMEA 0183, Signal K, remote desktop, Internet connection) with laptops, tablets and phones onboard. Connect to internet on port through the same device.
-* **Remote Desktop**. Access to OpenPlotter desktop from the cockpit through your mobile devices.
-* **Headless**. Easy start without monitor.
-* **SDR-AIS**. Receive and decode AIS with cheap DVB-T dongles. Calibration tools Included.
-* **Electronic Compass and Heel**. Read magnetic heading and heel angle from an IMU sensor. Tilt compensated. Calibration tools Included.
-* **Barograph, Thermograph and Hygrograph**. From pressure, temperature and humidity sensors. Save logs and display graphs to see trends.
-* **Multiple temperature sensors**. Get data from coolant engine, exhaust, fridge, sea...
-* **Special Sensors**. Detect opening doors/windows, tanks level, human body motion...
-* **Magnetic Variation**. Calculate magnetic variation for date and position.
-* **True Heading**. Calculate true heading from magnetic variation and magnetic heading.
-* **True Wind**. Calculate true wind from apparent wind and either speed through water (speed log) or speed over ground (GPS).
-* **Rate Of Turn**. Calculate the rate the ship is turning.
-* **Remote Monitoring**. Publish data on Twitter or send it by email.
-* **Actions System**. Compare a custom value with any data flowing through your system and use it as a trigger to run multiple predefined actions.
-* **Custom Switches**. Connect external switches and link them with actions.
-* **Handle External Devices**. Relays, LEDs, buzzers ...
-* **System Time Tools**. Set the system time from NMEA data and set the time zone easily.
-* **Startup Programs**. Select some program parameters to automatically launch at start.
+https://www.gitbook.com/book/sailoog/openplotter-documentation/details
 
 ## Project site
 
 http://www.sailoog.com/openplotter
 
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 ## Build instructions
 
 https://github.com/sailoog/openplotter/wiki
 
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 ![OpenPlotter RPI](https://sailoog.gitbooks.io/openplotter-documentation/content/en/openplotter_rpi.png)