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The [SparkFun RTK Torch](https://www.sparkfun.com/products/24672) is a centimeter-level GNSS receiver. With RTK enabled, these devices can output your location with 8mm horizontal and vertical [*accuracy*](https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/accuracy_verification/) at up to 20Hz!
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The [SparkFun RTK Torch](https://www.sparkfun.com/products/25662) is a centimeter-level GNSS receiver. With RTK enabled, these devices can output your location with 8mm horizontal and vertical [*accuracy*](https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/accuracy_verification/) at up to 20Hz. It supports Galileo E6 HAS and has built-in tilt compensation too!
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The [SparkFun RTK EVK](https://www.sparkfun.com/products/24342) is the perfect development platform for your fixed or mobile high-precision positioning and navigation needs. We called it the EVK (Evaluation Kit) as it truly covers all the options: L1 + L2 RTK GNSS, with L-Band correction built-in. Regarding connectivity, the SparkFun RTK EVK has it all: WiFi / Bluetooth®, Ethernet and LTE cellular!
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This repo houses the [RTK Product Manual](https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware) and the firmware that runs on the SparkFun RTK product line including:
For compiled binaries of the firmware, please see [SparkFun RTK Everywhere Firmware Binaries](https://github.com/sparkfun/SparkFun_RTK_Everywhere_Firmware_Binaries).
**Note:** Any serial menu that is shown below can also be accessed over Bluetooth. This makes any configuration of a device much easier in the field. Please see [Configure With Bluetooth](configure_with_bluetooth.md) for more information.
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# Configure with u-center
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On devices that have a u-blox GNSS receiver, the ZED-F9P GNSS 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).
SparkFun RTK devices transmit full NMEA sentences over Bluetooth serial port profile (SPP) at 2Hz and 115200bps. This means that nearly any GIS application that can receive NMEA data over a serial port (almost all do) can be used with SparkFun RTK devices. As long as your end system can open a serial port over Bluetooth (also known as SPP) your system can retrieve industry-standard NMEA positional data. The following steps show how to connect an external tablet, or cell phone to the RTK device so that any serial port-based GIS application can be used.
To get millimeter accuracy we need to provide the RTK unit with correction values. Corrections, often called RTCM, help the RTK unit refine its position calculations. RTCM (Radio Technical Commission for Maritime Services) can be obtained from a variety of sources but they fall into three buckets: Commercial, Public, and Civilian Reference Stations.
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Similarly, any SparkFun RTK device can be set up as an [NTRIP Client](menu_gnss.md#ntrip-client). The RTK device will connect to the local WiFi and begin downloading the RTCM data from the given NTRIP Caster and RTK Fix will be achieved. This is useful only if the Rover remains in RF range of a WiFi access point. Because of the limited range, we recommend using a cell phone's hotspot feature rather than a stationary WiFi access point for NTRIP Clients.
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Cellular can even be used in Base mode. We have seen some very inventive users use an old cell phone as a WiFi access point. The base unit is configured as an NTRIP Server with the cellphone's WiFi AP credentials. The base performs a survey-in, connects to the WiFi, and the RTCM data is pushed over WiFi, over cellular, to an NTRIP Caster.
The RTK EVK has built-in cellular via a u-blox LARA-R6001D. However, the RTK Everywhere firmware does not yet support cellular. Adding it is on our roadmap. Stay tuned for updates! Meanwhile, we do have a stand-alone EVK code example which will connect to PointPerfect localized distribution via cellular:
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* [EVK example 8_5_PointPerfect_MQTT](https://github.com/sparkfun/SparkFun_RTK_EVK/tree/main/Example_Sketches/8_5_PointPerfect_MQTT)
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* [EVK example 8_6_PointPerfect_MQTT_WiFi_ETH_Cellular](https://github.com/sparkfun/SparkFun_RTK_EVK/tree/main/Example_Sketches/8_6_PointPerfect_MQTT_WiFi_ETH_Cellular)
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## L-Band
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What if you are in the field, far away from WiFi, cellular, radio, or any other data connection? Look to the sky!
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A variety of companies provide GNSS RTK corrections broadcast from satellites over a spectrum called L-Band. [L-Band](https://en.wikipedia.org/wiki/L_band) is any frequency from 1 to 2 GHz. These frequencies have the ability to penetrate clouds, fog, and other natural weather phenomena making them particularly useful for location applications.
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These corrections are not as accurate as a fixed base station, and the corrections can require a monthly subscription fee, but you cannot beat the ease of use!
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L-Band reception requires specialized RF receivers capable of demodulating the satellite transmissions. Currently, the [RTK Facet L-Band](https://www.sparkfun.com/products/20000) is the only product that supports L-Band correction reception.
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L-Band reception requires specialized RF receivers capable of demodulating the satellite transmissions. The RTK EVK has a built-in NEO-D9S corrections receiver. The RTK Everywhere firmware supports this and will tune the NEO-D9S to the correct frequency if you are in the US or EU. The PointPerfect L-Band corrections are encrypted and require a subscription and valid keys in order to work. The EVK comes with a one month free subscription to PointPerfect L-Band + IP, providing built-in support for L-Band corrections and IP corrections via Ethernet or WiFi.
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## Serial Radios
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The RTK EVK has screw cage terminals providing access to the ZED-F9P UART2 TX2 and RX2 pins. 3.3V power is provided too, but not 5V. For 5V radios, you may need an additional power source.
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These radios attach nicely to the back or bottom of an RTK device.
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The benefit of a serial telemetry radio link is that you do not need to configure anything; simply plug two radios onto two RTK devices and turn them on.
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## Ethernet
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Ethernet-equipped RTK devices send and receive correction data via Ethernet.
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