How to Enable or Disable GNSS Constellations (u-center)

What You Need:

  • u-center 2 software (from u-blox.com)

  • USB-to-UART adapter connected to the module’s USB-TTL port

  • Module powered via 5V

Step-by-Step Instructions:

  1. Connect the Module

    • Open u-center

    • Go to Receiver → Connection and select your COM port.

    • Wait for the GNSS data stream (NMEA or UBX) to appear.

  2. Open GNSS Configuration

    • Go to View → Configuration View (or press F9).

    • In the left pane, select GNSS (CFG-GNSS).

  3. Select/Deselect Constellations

    • Tick the checkboxes to enable:

      • GPS

      • Galileo

      • QZSS

      • BeiDou

      • NavIC (IRNSS) → Select L5 only

    • You can disable unused constellations to reduce power consumption or optimize TTFF.

  4. Save Your Settings

    • Click the blue Send (→) button at the bottom.

    • Then go to UBX → CFG → CFG in View → Messages View.

    • Choose:

      • Save to BBR (Battery-backed RAM)

      • Save to Flash

    • Click Send again to store the configuration permanently.

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