Topcon 3D-MC / MC-X1

Connect a Topcon 3D-MC or MC-X1 machine control system to RTKdata.com for centimeter-level RTK positioning on excavators, dozers, and graders. Topcon machine control systems are not locked to TopNET Live — they accept RTCM corrections from any standard NTRIP caster.

Key capabilities

Feature	Details
Compatible systems	Topcon 3D-MC, MC-X1
Compatible displays	GX-60, GX-77
Compatible receivers	MC-R3, MC-I3
MC-I3 connectivity	Internal 3G/4G modem with SIM slot
MC-R3 connectivity	External modem or phone hotspot required
Locked to TopNET Live?	No — accepts any NTRIP provider
Correction format	RTCM 3.x via NTRIP
Configuration path	Topcon Logo > Tools > Configure Radios > NTRIP tab

Requirements

• Topcon 3D-MC or MC-X1 machine control system

• Display: GX-60 or GX-77

• Receiver: MC-R3 or MC-I3

• Internet connection: MC-I3 internal modem with active SIM card, or external modem / phone hotspot for MC-R3

• RTKdata account: Active subscription with NTRIP credentials

Don't have an RTKdata.com account yet? Start 30-day Free Trial or View Pricing

Step-by-step setup

1

Power on and verify internet connectivity

1. Power on the machine control system (display and receiver).

2. If using an MC-I3: Insert a SIM card with an active data plan into the internal modem slot. Verify cellular signal on the display.

3. If using an MC-R3: Connect an external cellular modem or pair with a phone hotspot for internet access.

2

Open the NTRIP configuration

1. On the GX-60 or GX-77 display, tap the Topcon Logo in the corner of the screen.

2. Navigate to Tools > Configure Radios.

3. Select the NTRIP tab.

3

Enter RTKdata.com NTRIP settings

Fill in the NTRIP connection fields:

North America

• Host (domain): rtk.rtkdata.com

• Host (IP fallback): 13.56.117.10

• Port: 2101

• Username / Password: From RTK Credentials in the internal dashboard (not website login)

• Mountpoint (ALL CAPS): AUTO

Europe

Australia

Type AUTO manually in ALL CAPS. Do not browse the source table — enter the mountpoint name directly.

4

Connect and verify RTK status

1. Tap Connect or Apply to save the settings and initiate the NTRIP connection.

2. Monitor the GNSS/RTK status indicator on the display:

Status	Meaning
Autonomous / GPS	Basic satellite fix. No corrections applied.
DGPS / Float	Correction data arriving and being processed.
RTK Fixed	Centimeter-level accuracy achieved. Ready for machine control operations.

1. Convergence to RTK Fixed typically takes 30–90 seconds with clear sky visibility.

For machine control operations, always wait for RTK Fixed before beginning grading, excavation, or dozing. Working in Float mode may result in elevation errors that affect cut/fill accuracy.

Vertical reference (heights)

RTK corrections deliver ellipsoidal heights (height above the WGS 84 ellipsoid), not orthometric heights. For machine control, you typically work with a local site calibration or localization that accounts for the geoid. Configure the appropriate vertical datum in your Topcon project settings.

Troubleshooting

Problem	Cause	Fix
NTRIP tab not visible	Older firmware	Update the display and receiver firmware. The NTRIP tab may not appear on very old firmware versions.
No internet (MC-I3)	SIM card missing or no data plan	Verify the SIM card is inserted and has an active cellular data plan.
No internet (MC-R3)	No external modem connected	Connect an external modem or pair with a phone hotspot. The MC-R3 does not have an internal modem.
Connection fails	Wrong host or port	Double-check the host address for your region and confirm port is 2101.
Authentication error	Wrong credentials	Use the username and password from your RTKdata dashboard, not your website login. Credentials are case-sensitive.
Stuck on Float	Poor sky visibility	Move the machine to an open area. GNSS antennas on heavy equipment can be partially obstructed by booms, cabs, and nearby structures.
Stuck on Float	Receiver issue	Power-cycle the receiver. If Float persists, verify the receiver has an RTK-capable license/configuration.
Mountpoint error	Wrong capitalization	Type AUTO in ALL CAPS.

Tips

• Not locked to TopNET Live. You can use any standard NTRIP caster, including RTKdata.com. No Topcon-specific subscription is required for the NTRIP connection.

• MC-I3 is the simplest setup — its internal modem with SIM slot means no external devices are needed for internet connectivity.

• MC-R3 users should consider a dedicated cellular modem mounted on the machine for the most reliable connection, rather than relying on a phone hotspot.

• Site calibration is critical. Before starting machine control work, perform a site localization/calibration to align RTK coordinates with your design surface.

• Vibration and multipath. Heavy equipment environments can cause multipath interference. Ensure the GNSS antenna is mounted as high and clear as possible on the machine.

• Keep firmware updated on both the display and receiver for the latest NTRIP client improvements and constellation support.