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In addition to providing accurate local location fixes, the SparkFun RTK devices can also serve as a correction source, also called a *Base*. The Base doesn't move and 'knows' where it is so it can calculate the discrepancies between the signals it is receiving and what it should be receiving. These differences are the correction values passed to the Rover so that the Rover can have millimeter level accuracy.
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There are two types of bases: *Surveyed* and *Fixed*. A surveyed base is often a temporary base setup in the field. Called a 'Survey-In', this is less accurate but requires only 60 seconds to complete. The 'Fixed' base is much more accurate but the precise location at which the antenna is located must be known. A fixed base is often a structure with an antenna bolted to the side. Raw satellite signals are gathered for a few hours then processed using Precision Point Position. We have a variety of tutorials that go into depth on these subjects but all you need to know is that the RTK Facet supports both Survey-In and Fixed Base techniques.
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Please see the following tutorials for more information:
The Base Menu allows the user to select between Survey-In or Fixed Base setups.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Base_Menu.jpg)
From the main menu, pressing 1 will bring up the GNSS Receiver configuration menu. The ZED-F9P is immensely configurable. The RTK device will, by default, put the ZED-F9P into the most common configuration for rover/base RTK for use with *SW Maps*.
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The GNSS Receiver menu allows a user to change the report rate, dynamic model, and select which constellations should be used for fix calculations.
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# L-Band Menu
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Surveyor:  / Express:  / Express Plus:  / Facet:  / Facet L-Band: 
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**Note:** This section only applies to RTK Facet *L-Band* products. Regular RTK Facet, Surveyor, Express, and Express Plus products do not have L-Band antennas or receivers built in.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/2/1/8/8/SparkFun_RTK_LBandA.jpg)
These seven sentences are commonly used when logging and doing Precise Point Positioning (PPP) or Post Processed Kinematics (PPK). You can read more about PPP [here](https://learn.sparkfun.com/tutorials/how-to-build-a-diy-gnss-reference-station).
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**Turn off all messages** will turn off all messages. This is handy for advanced users who need to start from a blank slate.
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## Turn off all messages
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This will turn off all messages. This is handy for advanced users who need to start from a blank slate.
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**Turn on all messages** will turn on all messages. This is a setting used for firmware testing and should not be needed in normal use.
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## Turn on all messages
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This will turn on all messages. This is a setting used for firmware testing and should not be needed in normal use.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Messages_Menu_-_NMEA.jpg)
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*Configuring the NMEA messages*
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As mentioned is the microSD section of the [Hardware Overview](https://learn.sparkfun.com/tutorials/sparkfun-rtk-facet-hookup-guide/all#hardware-overview) there are a large number of messages supported. Each message sub menu will present the user with the ability to set the message report rate.
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**Note:** The message report rate is the *number of fixes* between message reports. In the image above, with GSV set to 4, the NMEA GSV message will be produced once every 4 fixes. Because the device defaults to 4Hz fix rate, the GSV message will appear once per second.
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**Note:** The message report rate is the *number of fixes* between message reports. In the image above, with GSV set to 4, the NMEA GSV message will be produced once every 4 fixes. Because the device defaults to 4Hz fix rate, the GSV message will appear once per second.
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## ESF Messages
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The ZED-F9R, found only on the Express Plus, supports additional External Sensor Fusion messages. These messages show the raw accelerometer and gyroscope values of the internal IMU.
[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Ports_Menu.jpg)
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*Baud rate configuration of Radio and Data ports*
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## Surveyor Data Port
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By default the Data port is set to 460800bps and can be configured from 4800bps to 921600bps. Note: The Data port does not output NMEA by default. The unit must be opened and the *Serial NMEA Connection* switch must be moved to 'Ext Connector'. See [Hardware Overview - Advanced Features](https://learn.sparkfun.com/tutorials/sparkfun-rtk-surveyor-hookup-guide/all#hardware-overview---advanced-features) for the location of the switch.
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By default the Data port is set to 460800bps and can be configured from 4800bps to 921600bps.
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Note: The Data port does not output NMEA by default. The unit must be opened and the *Serial NMEA Connection* switch must be moved to 'Ext Connector'. See [Hardware Overview - Advanced Features](https://learn.sparkfun.com/tutorials/sparkfun-rtk-surveyor-hookup-guide/all#hardware-overview---advanced-features) for the location of the switch.
Note: Because the ESP32 does considerable configuration of the ZED-F9P at power on it is not recommended to modify the settings of the ZED-F9P. Nothing will break but your changes may be overwritten.
The ZED-F9P module can be configured independently using the u-center software from u-blox by connecting a USB cable to the *Config u-blox* USB connector. Settings can be saved to the module between power cycles. For more information please see SparkFun’s [Getting Started with u-center by u-blox](https://learn.sparkfun.com/tutorials/getting-started-with-u-center-for-u-blox/all).
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The ZED-F9P module can be configured independently using the u-center software from u-blox by connecting a USB cable to the *Config u-blox* USB connector. Settings can be saved to the module between power cycles. For more information please see SparkFun’s [Getting Started with u-center by u-blox](https://learn.sparkfun.com/tutorials/getting-started-with-u-center-for-u-blox/all).
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However, because the ESP32 does considerable configuration of the ZED-F9P at power on it is not recommended to modify the settings of the ZED-F9P using u-center. Nothing will break but your changes will likely be overwritten at the next power cycle.
Note: All system configuration can also be done by editing the *SFE_XXX_Settings_0.txt* file (example shown above) where XXX is Facet, Express, Surveyor, etc and 0 is the profile number (0, 1, 2, 3). This file is created when a microSD card is installed. The settings are clear text but there are no safety guards against setting illegal states. It is not recommended to use this method unless You Know What You're Doing®.
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All system configuration can also be done by editing the *SFE_XXX_Settings_0.txt* file (example shown above) where XXX is Facet, Express, Surveyor, etc and 0 is the profile number (0, 1, 2, 3). This file is created when a microSD card is installed. The settings are clear text but there are no safety guards against setting illegal states. It is not recommended to use this method unless You Know What You're Doing®.
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