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Topcon X35 / XD+ (AGI-4 / AGS-2)

These steps connect a Topcon X35 / XD+ (AGI-4 / AGS-2) to the Premium Positioning correction network over NTRIP, using Horizon. They assume you already have your NTRIP credentials.

Before you start

  • Your NTRIP username and password, from your Premium Positioning welcome email or your account on the customer portal.

  • Horizon.

  • A working internet connection on the controller or phone.

  • A clear view of the sky at the point you are measuring.

Network settings

These are the same for every Premium Positioning customer. Only your username and password are unique to you.

  • Server or host: rtkpremium.xyz

  • Port: 2101

  • Mountpoint: COMMON

  • Protocol: NTRIP

Steps

  1. Confirm your hardware is RTK-ready: On the X35 / XD+ console (Horizon) with an AGI-4 or AGS-2 receiver, Network RTK / NTRIP requires the receiver unlocked for RTK and a working internet connection (the AGI-4 normally needs the RTK/IMU unlock plus an internal cellular SIM or an approved Wi-Fi/cellular modem). If unsure your unit is RTK-enabled, check with Premium Positioning first.

  2. Open the GPS Correction setup screen: From the Horizon home screen open the menu and go to System > GPS > Correction. This opens the GPS Correction Source screen (the GPS section is under System, correction options under it).

  3. Set the Correction Source to RTK (NTRIP): Tap CORRECTION SOURCE and change it from Autonomous to RTK (NTRIP). Wording may read 'RTK', 'NTRIP' or 'RTK (NTRIP)' by firmware - choose the option for Network RTK over the internet (NTRIP).

  4. Let the modem / connection wizard run: When RTK (NTRIP) is selected, Horizon runs a short wizard to detect the modem or cellular/Wi-Fi connection. Allow it to finish. If it can't find a connection, confirm your SIM/data plan or Wi-Fi modem is active, then retry.

  5. Open the NTRIP Setup screen: After the wizard, Horizon shows the NTRIP Setup screen (also under System > GPS, NTRIP tab). Enter the caster details on the right, and (if using a receiver SIM) the GSM/APN details on the left.

  6. Enter the NTRIP Address (caster host): Tap NTRIP ADDRESS and enter exactly: rtkpremium.xyz (no http://, no spaces). Sometimes called the caster, server or end point.

  7. Enter the NTRIP Port: Tap NTRIP PORT and enter: 2101

  8. Enter the NTRIP Mount Point: Tap NTRIP MOUNT POINT and enter: COMMON (capitals). If your firmware can fetch the source table, select COMMON from the list.

  9. Enter YOUR NTRIP Username: Tap NTRIP USERNAME and enter the username from your welcome email - your own personal login, case-sensitive.

  10. Enter YOUR NTRIP Password: Tap NTRIP PASSWORD and enter the password from your welcome email, exactly (case-sensitive). Premium Positioning never sets these for you - they are unique to your account.

  11. Set the cellular / data details if using a SIM: If the receiver connects through its own SIM rather than Wi-Fi, fill the GSM fields on the left (GSM APN is the key one - your carrier's APN; GSM USERNAME/PASSWORD/PIN only if required; ALLOW 3G/roaming as appropriate). If you connect via Wi-Fi or the console's data link, leave the GSM fields as they are.

  12. Save and let the connection establish: Close the NTRIP Setup screen to save. Horizon dials the caster and starts streaming. The receiver needs a standalone position first to send its location, so give it clear sky and a minute or two.

  13. Confirm an RTK Fixed solution: Check the GPS/correction status (the satellite/GPS icon in the top status bar, or System > GPS status). Wait until it reports RTK Fixed ('Fixed', 'RTK Fix' or 'RTK Integer') - cm-level accuracy. If it stays on 'Float', 'DGPS', 'Autonomous' or 'No correction', recheck the caster details, mount point, your username/password, and that you have live internet and open sky.

If the fix will not hold

Network RTK over NTRIP needs live internet on the receiver/console (cellular SIM, Wi-Fi or modem) and open sky. Menu wording, the correction-type label and the fix-status text differ slightly between Horizon firmware versions and between X35 and XD+ - if a label differs, choose the equivalent (Network RTK / NTRIP over the internet).

For more, see RTK corrections troubleshooting and Fix inconsistent RTK accuracy on site.

Need help

Support is available 24/7. Include your receiver model, the mountpoint, the solution status, and the correction age when you get in touch.

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