The SparkFun RTK mosaic-X5 is a high-precision GNSS positioning and navigation receiver built around the Septentrio mosaic-X5 multi-constellation, multi-frequency module. Supporting GPS, GLONASS, Beidou, Galileo, NavIC, SBAS, and QZSS across L1/L2/L5 bands, the 448-channel receiver delivers centimetre-level positioning accuracy when used with RTK corrections.

Configurable as either an RTK Base (feeding corrections to rovers) or an RTK Rover (receiving corrections for 6 mm + 0.5 PPM horizontal accuracy), the mosaic-X5 supports position updates at up to 100 Hz — ideal for robotics and autonomous systems. The receiver runs a full internal web server for configuration and monitoring via any standard browser, and supports logging in RINEX, NMEA, and Septentrio SBF formats.

An ESP32-WROVER processor (16 MB flash, 8 MB PSRAM) provides WiFi and Bluetooth connectivity. The mosaic-X5 can connect directly to an Ethernet network (with Power-over-Ethernet support), or link its Ethernet port to the ESP32 for WiFi bridging. All I/O connections use robust 3.5 mm screw terminals with selectable 3.3 V or 5 V logic levels. The custom extruded aluminium case with machined end panels features slotted flanges for easy mounting.

Key Features

• Septentrio mosaic-X5 Module – 448-channel multi-constellation, multi-frequency GNSS receiver with AIM+ interference mitigation
• RTK Positioning – 6 mm + 0.5 PPM horizontal accuracy with correction data; configurable as base or rover
• 100 Hz Update Rate – Position updates 100 times per second for real-time applications
• Multi-Format Logging – Direct logging to microSD in RINEX, NMEA, SBF, RTCM, and CMR formats
• ESP32-WROVER Processor – Provides WiFi/Bluetooth connectivity and Ethernet-to-WiFi bridging (16 MB flash, 8 MB PSRAM)
• Dual Ethernet Interfaces – Independent 10/100 Mbps connections for mosaic-X5 and ESP32 with auto-negotiate and Auto MDI/MDI-X
• Power-over-Ethernet – PoE support (36–57 V) for single-cable installations
• OLED Display – 128 × 64 pixel display for status monitoring
• Aluminium Enclosure – Custom extruded case with machined end panels and IP42 ingress protection
• Multiple Power Options – USB-C (mosaic-X5 or ESP32), PoE, or external DC (9–36 V via screw terminals, fully isolated)
• 5 V Active Antenna – SMA connector provides 5 V power for the included L1/L2/L5 surveying antenna

Supported GNSS Signals

• GPS – L1C/A, L1PY, L2C, L2P, L5
• GLONASS – L1CA, L2CA, L2P, L3 CDMA
• Beidou – B1I, B1C, B2a, B2b, B2I, B3
• Galileo – E1, E5a, E5b, E5 AltBoc, E6
• QZSS – L1C/A, L1 C/B, L2C, L5
• NavIC – L5
• SBAS – EGNOS, WAAS, GAGAN, MSAS, SDCM (L1, L5)
• L-band – On-module support for correction services

I/O Connections

• mosaic-X5 COM1 UART – TX, RX, RTS, CTS
• Event Inputs – EVENT-A and EVENT-B
• Timing Output – PPSO pulse-per-second output
• Log Button Input – External log trigger
• ESP32 UART – TX, RX, RTS, CTS
• ESP32 I²C – With level-shifting

Ideal For

• High-precision GNSS surveying and mapping
• Robotics and autonomous vehicle navigation
• RTK base station installations
• Precision agriculture
• Research and RINEX data collection

Package Contents

• 1× SparkFun RTK mosaic-X5 (cased receiver)
• 1× L1/L2/L5 GNSS Surveying Antenna
• 1× Reinforced RG58 TNC-SMA Cable (10 m)
• 1× SMA WiFi/Bluetooth Antenna
• 1× 32 GB microSD Card (Class 10)
• 1× USB-C Power Supply (5 V, 1 A wall adapter)
• 1× USB-C Cable (A to C, 2 m)
• 1× Ethernet Cable (CAT-6, 1 m)
• 1× Quick Start Guide

Resources

SparkFun RTK mosaic-X5

• Product Manual
• Quick Start Guide (PDF)
• Schematic (PDF)
• PCB Dimensions (PDF)
• Case Dimensions (PDF)
• Hardware Design (GitHub)
• ESP32 Firmware (GitHub)

Septentrio mosaic-X5

• Product Page
• Resources (datasheet, firmware, manual, software tools, USB driver)
• mowi Open-Source Design
• mowi Repository (GitHub)