SparkFun RTK Express Plus Kit

Sparkfun ElectronicsSKU: RB-Spa-2004
Manufacturer #: GPS-18589

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Sale price ¥143,450

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  • SparkFun RTK Express Plus Kit
  • Offers a Bluetooth enabled multi-band GNSS receiver
  • Comes with USB A to C cable
  • Built-in IMU
  • Embedded OLED display
  • Receives both L1C/A and L2C bands

The SparkFun RTK Express Plus Kit is a Bluetooth-enabled multi-band GNSS receiver with built-in IMU based on the ESP32 from Espressif and the ZED-F9R from u-blox. Power it up and you'll have 300mm approximate accuracy out of the box and 14 mm accuracy with RTCM corrections. This kit provides the L1/L2 antenna, adapters, interface cables, and chargers needed for general GNSS use.

The RTK Express Plus adds an internal IMU (ZED-F9R) to combine real-time GNSS tracking with advanced sensor fusion. The result is accurate automotive positioning even when GNSS is lost in tunnels, parking garages, etc.

SparkFun RTK Express Plus Kit - Click to Enlarge

The downside is the ZED-F9R does not support a base station or generate RTCM corrections. If you are implementing your own RTK base station, consider using products based on the ZED-F9P. The IMU algorithms only apply to automotive applications and will not increase or decrease regular 'clear view of the sky' positioning performance.

SparkFun RTK Express Plus Kit - Click to Enlarge

The RTK Express Plus Kit has everything you need to get centimeter-level global positioning measurements using GNSS RTK. This kit features a handy carrying case to protect the most expensive bits, allowing you to quickly attach the L1/L2 antenna and RTK Express Plus housing to the pole or tripod of your choice. The kit includes all the antenna bits, cables, and chargers you need to jump right into the field.

Note: The L1/L2 antenna has a 5/8 inch thread which will fit most surveying platforms. The kit includes a 5/8 to 1/4 inch adapter as well which will fit most camera monopods and tripods. You may need additional adapters for your specific equipment.

  • 1x SparkFun RTK Express Plus GNSS Receiver
  • 1x RTK Kit Carrying Case
  • 1x GNSS L1/L2 Multi-Band Antenna - TOP106
  • 1x Antenna Interface Cable - SMA to TNC (300 mm)
  • 1x 1/4 to 5/8 inchAntenna Thread Adapter
  • 1x USB Wall Charger - 5 V, 2 A
  • 1x USB A to C Cable - 0.8 m
  • 1x Data Cable
  • 1x Radio Cable


  • 132 x 101 x 32 mm / 5.2 x 3.9 x 1.2 inch
  • Antenna size: 148 x 55 mm
  • USB A to C cable length: 0.8 meter
  • Antenna interface cable length: 300 mm

  • Current: 68 mA - 130 mA
  • Time to First Fix: 25s (cold), 2s (hot)
  • Max Navigation Rate: PVT - 25 Hz | RTK - 20 Hz | Raw - 25 Hz
  • Horizontal Position Accuracy: 2.5 m without RTK | 0.010 m with RTK
  • Max Altitude: 50 km (31 miles)
  • Max Velocity: 500 m/s (1118 mph)
  • Internal Battery: LiPo 1300 mAh with 500 mA charging
  • Radio Port: 3.3 V TTL Serial (57600 bps RTCM TX/RX)
  • Data Port: 3.3 V TTL Serial (115200 bps NMEA)
  • Embedded OLED Display for available satellites, data logging, and more.
  • Push-button controls
  • Qwiic Connector: Included
  • microSD Socket for optional logging: Included
  • Weight: 162 g (an entire device including battery)

Bluetooth Transceiver (ESP32 WROOM)

  • Xtensa dual-core 32-bit LX6 microprocessor
  • Clock Frequency: Up to 240 MHz
  • Flash Storage: 16 MB
  • Internal SRAM: 520 KB
  • Integrated 802.11 BGN WiFi transceiver
  • Integrated dual-mode Bluetooth (classic and BLE)
  • Hardware-accelerated encryption (AES, SHA2, ECC, RSA-4096)
  • Deep Sleep Current: 2.5 µA

GNSS Multi-Band L1/L2 Surveying Antenna

  • Gain: ≥5 dBi
  • LNA Gain: 40 dB
  • Reception Frequencies: L1: 1555 to 1615 MHz | L2: 1198 to 1278 MHz
  • Antenna Impedance: 50 Ohm
  • Waterproof IP67
  • Connector: Female TNC
  • Bare antenna element weight (including MMCX connector, with RF shield): 160 g
  • Weight: 335 g

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