> For the complete documentation index, see [llms.txt](https://docs.premium-positioning.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.premium-positioning.com/guides/survey-receivers/topcon-gr-5-hiper-sr.md). # Topcon GR-5 / HiPer SR Connect a Topcon GR-5 or HiPer SR to RTK Premium corrections over NTRIP using MAGNET Field: caster settings and the steps to a fixed solution. These steps connect a Topcon GR-5 / HiPer SR to the Premium Positioning correction network over NTRIP, using MAGNET Field. 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 in the XYZ Platform. * No account yet? Start a [14-day free trial](https://www.premium-positioning.com/start-14-day-free-trial?utm_source=docs\&utm_medium=referral\&utm_campaign=docs\&utm_content=topcon-gr-5-hiper-sr) to get your credentials. * MAGNET Field. * A working internet connection on the controller or phone. * No phone or hotspot in the field? If your controller or receiver takes a SIM, Premium Positioning [IoT SIMs](https://www.premium-positioning.com/products?utm_source=docs\&utm_medium=referral\&utm_campaign=docs\&utm_content=topcon-gr-5-hiper-sr#iot-sims) give it its own data connection. * 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. Power on and connect the receiver: Switch on the GR-5 / HiPer SR and the MAGNET Field controller. In MAGNET Field open a job, then tap the Connect / Bluetooth icon (or Configure > Connections) and pair the receiver. Confirm connected status before continuing. 2. Open the survey configurations: Tap Configure, then Survey. Under GPS+ Configuration (sometimes GNSS/Survey configuration) tap the list / three-dot button, then Add (+) to create a new one. 3. Choose a Network RTK configuration: Name the configuration and set Type to Network RTK (the rover-over-internet mode used for a caster). 4. Set the Rover Receiver options: On the Rover Receiver tab select Receiver Model (GR-5 or HiPer SR), set Protocol to NTRIP, and set the Antenna to match. Set Antenna Height to your actual pole height. 5. Set the data link to the controller modem: On the Rover Modem tab set Modem / Connect to Controller, so MAGNET uses the controller's own internet (Wi-Fi or SIM) rather than a radio. Make sure the controller has working internet. 6. Enter the caster host and port: In the network/internet settings enter Host: rtkpremium.xyz and Port: 2101. Confirm Protocol is NTRIP. 7. Enter YOUR NTRIP username and password: Enter the NTRIP user name and password from your Premium Positioning welcome email - unique to your account; do not use example values or leave blank. 8. Save and start the survey: Save the configuration, then select it as the active Survey configuration. Go to Survey / Topo to begin and trigger the caster connection. 9. Load the source table (mount point list): On connect, MAGNET requests the source table. If it doesn't load automatically, tap the mount-point drop-down (a 'no mount point to connect to automatically' prompt may appear) to fetch the list. 10. Select the COMMON mount point: From the source table choose COMMON (sort by Mountpoint/Format/Distance to find it) and confirm. 11. Connect to the caster: Tap Connect. MAGNET logs in with your credentials and streams corrections - look for a 'Data received' indicator. 12. Confirm a Fixed solution: Watch the solution status move Autonomous/Standalone → Float → Fixed (usually under a minute with good sky). Only record/stake once Fixed. If it stays Float, re-check internet, the COMMON mount point, and your credentials. ### If the fix will not hold The controller needs working internet (Wi-Fi or SIM) because Modem Connect is set to Controller. Menu wording differs slightly between MAGNET Field versions (GPS+ Configuration vs GNSS/Survey configuration, Rover Modem vs Rover Internet) - match the closest equivalent. Same MAGNET Field workflow as Topcon HiPer VR and Sokkia. For more, see [RTK corrections troubleshooting](/troubleshooting/rtk-corrections-troubleshooting.md) and [Inconsistent RTK accuracy on site](/troubleshooting/inconsistent-rtk-accuracy-on-site.md). ### FAQ How do I connect a Topcon GR-5 or HiPer SR to an NTRIP RTK service? You create a Network RTK survey configuration in MAGNET Field, set the protocol to NTRIP and set the rover modem to connect through the controller. The steps above take you from pairing the receiver to a Fixed solution. What are the NTRIP settings for a HiPer SR on RTK Premium? Use host rtkpremium.xyz, port 2101, mountpoint COMMON and protocol NTRIP, with the username and password from your welcome email. The caster streams RTCM 3.x corrections over NTRIP. Why does my GR-5 stay in Float in MAGNET Field? The usual causes are a controller without working internet, the wrong mount point or wrong credentials. The network also needs the rover's approximate position (GGA) to build the correction for where you are, so check that it is being sent and that the sky view is clear. The mount point list does not load in MAGNET Field. What should I do? Tap the mount-point drop-down to fetch the source table if MAGNET does not load it on connect. If the list still does not appear, check the controller's internet connection, the host, the port and your credentials. Does the Topcon HiPer SR work with RTK Premium? It does. This guide covers the GR-5 and HiPer SR in MAGNET Field, and you can test the connection on your own receiver with a 14-day free trial. ### Need help Support runs on business days from 09:00 CET to 17:00 ET. Contact us at or +31 85 0606 338, and include your receiver model, the mountpoint, the solution status, and the correction age. Last updated: 11 October 2026