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Septentrio mosaic-go

The Septentrio mosaic-go receivers are evaluation kits for their mosaic-X5 and mosaic-H receiver modules. Because of their small size and low weight, they are ideal for autopilot applications. The available variants are the mosaic-go and mosaic-go heading.

Mosaic go Highly Accurate GNSS Receiver Module

Their features include the following:

  • High update rate (>100 Hz) and low latency, both crucial for control systems of autonomous applications
  • Reliable centimetre-level positioning
  • Full L2 support via P(Y) code
  • Size: 71 x 59 x 12 mm ± 1mm
  • Weight: 58g ± 1g


The mosaic-go kit is available on Septentrio's official store:

Other PX4 supported devices from Septentrio:

mosaic-go Evaluation Kit Contents

  • 1 mosaic-H or mosaic-X5 module soldered on an interface board inside a metallic housing.
  • 1 USB cable
  • 6-pin COM1 open-ended cable
  • 4-pin COM2 open-ended cable
  • Help user guide card

Physical Interfaces

USB Micro-BUSBUSB communication and power
RSV USB Micro-BRSVReserved and should not be used
SMARF-IN{1,2}Main (and auxiliary) antenna connections
6-pin JSTSerialSerial communication and power
4-pin JSTSerialSerial communication
microSDTF CARDSerial communication

Dual-antenna is only available on mosaic-H-based receivers.

6-pin Connector

Connector type: GH connector, 1.25mm pitch, 6 way. Mating connector housing: GHR-06V-S.

Pin NameDirectionLevelDescriptionComment
VCCPWR4.75V-5.5VMain power supply
TXD1Out3V3_LVTTLSerial COM1 transmit lineDirectly connects to TXD1 of internal mosaic
RXD1In3V3_LVTTLSerial COM1 receive lineDirectly connects to RXD1 of internal mosaic
PPSOut3V3_LVTTLPPSoutputPPSO from mosaic converted to 3.3V
EVENTIn3V3_LVTTLEvent timer inputConnects to EVENTA of mosaic through a 3V3to 1V8 level translator

4-pin Connector

Connector type: GH connector, 1.25mm pitch, 4way. Mating connector housing: GHR-04V-S.

Pin NameDirectionLevelDescriptionComment
NRSTIn3V3_LVTTLReset inputDirectly connects to nRST_IN of internal mosaic
TXD2Out3V3_LVTTLSerial COM2 transmit lineDirectly connects to TXD2 of internal mosaic
RXD2In3V3_LVTTLSerial COM2 receive lineDirectly connects to RXD2 of internal mosaic

PX4 Configuration

PX4 configuration is covered in Septentrio GNSS Receivers.

Hardware Connection Example Pixhawk 4

  1. Make sure the receiver is powered with at least 3.3V. You can use the USB Micro-B connector or the 6-pin JST connector.
  2. Connect one or two GNSS antennas to the RF-IN ports on the mosaic-go.
  3. Connect the 6-pin connector (COM1) to the Pixhawk's GPS MODULE port. This will provide power to the mosaic-go and with this single connection it will be able to send single and dual-antenna information to the Pixhawk 4.

Wiring diagram, Pixhawk 4 - mosaic-go


Make sure the JST cable is wired correctly since this is not a standard cable:

Wiring of JST cable


The attitude (heading/pitch) can be computed from the orientation of the baseline between the main and the aux1 GNSS antennas.

Multi-antenna attitude determination setup

To enable multi-antenna attitude determination, follow the following procedure:

  1. Attach two antennas to your vehicle, using cables of approximately the same length. The default antenna configuration is as depicted in the figure. It consists in placing the antennas aligned with the longitudinal axis of the vehicle, main antenna behind AUX1. For best accuracy, try to maximize the distance between the antennas, and avoid significant height difference between the antenna ARPs.
  2. In practice, the two antenna ARPs may not be exactly at the same height in the vehicle frame, or the main-aux1 baseline may not be exactly parallel or perpendicular to the longitudinal axis of the vehicle. This leads to offsets in the computed attitude angles. These can be compensated for with the heading parameters provided by the Septentrio driver in PX4.


For optimal heading results, the two antennas should be seperated by at least 30cm / 11.8 in (ideally 50cm / 19.7in or more).

For additional configuration of the dual antenna setup, please refer to our Knowledge Base or the hardware manual.

Web App

mosaic-H GPS/GNSS receiver module with heading comes with fully documented interfaces, commands and data messages. The included GNSS receiver control and analysis software RxTools allows receiver configuration, monitoring as well as data logging and analysis.

The receiver includes an intuitive web user interface for easy operation and monitoring allowing you to control the receiver from any mobile device or computer. The web interface also uses easy-to-read quality indicators ideal to monitor the receiver operation during the job at hand.

Septentrio web user interface

LED Status

LED ColorPoweredSD card mountedPVT SolutionLogging enabled
Purple + Blue✓️✓️✓️✓️
Red + Green✓️✓️✓️


For more detailed information about the mosaic-go and its module, please refer to the hardware manual or the Septentrio Support page.