SparkFun

SparkPNT RTK Facet mosaic GNSS Receiver

Name: SparkPNT RTK Facet mosaic GNSS Receiver
Brand: SparkFun
SKU: SF-GPS-29688

· MPN: GPS-29688

GPS & Location Sensors

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The RTK Facet mosaic is a high-precision GNSS receiver for geolocation, surveying and GIS work. It uses Septentrio’s multi-band mosaic-X5 receiver and can de...

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The RTK Facet mosaic is a high-precision GNSS receiver for geolocation, surveying and GIS work. It uses Septentrio’s multi-band mosaic-X5 receiver and can deliver centimetre-grade positioning with RTK support.

Connect it to a phone or tablet over Bluetooth® to send NMEA data into compatible GIS software. It works with common Android, iOS and Windows tools including SW Maps, Field Genius, SurvPC, Survey Master, Vespucci, QGIS, QField, and other GIS software that supports NMEA over Bluetooth.

Inside the unit is an ESP32 WROOM connected to the mosaic-X5 GNSS receiver, plus supporting hardware including a LiPo fuel gauge and microSD. Under the dome is a surveyor-grade L1/L2/L5 GNSS antenna, and the firmware is programmed in Arduino so advanced users can tailor it to their needs.

It can also log NMEA and RINEX for post-processing, making it useful for research and advanced positioning applications. The hardware is open-source, with electrical and mechanical design files available for viewing, modification, maintenance and repair.

Features:

RTK positioning: With Real Time Kinematic support, 6mm-level fixes are less than a minute away.
Bluetooth® NMEA output: Lets a phone or tablet receive NMEA output for use with GIS software.
GIS software support: Works with SW Maps Android / iOS, Field Genius, SurvPC, Survey Master, Vespucci, QGIS, QField, and any GIS software that supports NMEA over Bluetooth.
GNSS Positioning: ~40cm accuracy, also known as Rover.
GNSS Positioning with RTK: 6mm accuracy, also known as Rover with RTK Fix.
GNSS Base Station: Can operate as a GNSS base station.
GNSS Base Station NTRIP Server: Can operate as a GNSS base station NTRIP server.
Data logging: Can log NMEA and RINEX for post-processing.
Open-source hardware: Electrical and mechanical design files can be obtained, viewed and modified.
Arduino programmable: Programmed in Arduino and can be tailored to fit your needs.

Specifications:

GNSS receiver: multi-band mosaic-X5 from Septentrio.
Microcontroller: ESP32 WROOM.
Peripheral hardware: LiPo fuel gauge, microSD, etc.
Antenna: surveyor-grade L1/L2/L5 GNSS antenna.
Output: NMEA over Bluetooth®.
Logging formats: NMEA and RINEX.
Programming environment: Arduino.
Supported platforms: Android, iOS and Windows GIS software that supports NMEA over Bluetooth.
Permanent outdoor mounting: Not designed for permanent outdoor mounting.
Previous product name: Identical to the retired SparkPNT RTK Facet mosaic L-Band.
PointPerfect L-Band service sunset: Scheduled to end on December 31, 2025.

For installations that need long-term outdoor exposure, choose a product intended for permanent mounting instead.

Jargon buster

Plain-language definitions for the technical terms used above.

ESP32: ESP32 is a family of low-cost microcontroller chips and modules from Espressif with built-in WiFi and Bluetooth. They support programmable firmware and over-the-air updates, and are commonly programmed with toolchains such as the Arduino core and ESP-IDF.
GNSS: GNSS stands for Global Navigation Satellite System, an umbrella term for satellite positioning networks such as GPS, GLONASS, Galileo and BeiDou. Receivers use these satellites to determine position, and high-precision units can output a steady stream of serial position data.
L5: A modern GNSS signal band used by several satellite systems for more accurate and robust positioning. Dual-band receivers that include L5 can often perform better than single-band receivers, especially for RTK and areas with reflected signals.
LiPo: A LiPo (lithium polymer) battery is a rechargeable lithium battery widely used in portable projects because it is light and compact. LiPo cells need correct charging circuitry and careful handling to stay safe, so equipment that supports LiPo generally includes charging or protection hardware suited to that battery type.
microcontroller: A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
RTK: Real-Time Kinematic positioning is a GNSS technique that uses correction data from a base station to greatly improve location accuracy. It matters if you need centimetre-level positioning for robotics, mapping, surveying, or tracking rather than ordinary metre-level GPS accuracy.