Hemisphere S631 / S321

These steps connect a Hemisphere S631 / S321 to the Premium Positioning correction network over NTRIP, using Carlson SurvCE / SurvPC. 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.

• Carlson SurvCE / SurvPC.

• 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. Get the receiver internet-ready: You need a live internet path. Easiest: the data collector's own connection (its SIM or a phone/MiFi hotspot). The S631 also has a built-in 4G modem if you fit a SIM and set the APN. Power on and confirm it's tracking satellites.

2. Pair the receiver over Bluetooth: Pair the S631/S321 to the data collector via Bluetooth in the device OS first (it broadcasts under its serial number) so it's available to SurvCE/SurvPC.

3. Open Equip > GPS Rover: Launch Carlson SurvCE/SurvPC, open/start a job, then Equip > GPS Rover. Four tabs appear: Current, Comms, Receiver, RTK.

4. Set Manufacturer and Model (Current tab): Set Manufacturer to 'Hemisphere GNSS' and Model to 'S631' or 'S321'. List wording varies slightly by version - pick the closest Hemisphere entry.

5. Connect on the Comms tab: On Comms set Type to Bluetooth, select the paired S631/S321, and tap the green check / Connect. It reports a successful connection.

6. Choose the internet device (RTK tab): On the RTK tab set Device to 'Data Collector Internet' if the collector/phone provides the connection, or 'Internal GSM' if the SIM is in the receiver (tap the wrenches icon to set the APN).

7. Set Network to NTRIP: Set Network to 'NTRIP', then tap the wrenches icon next to Network to open the NTRIP Broadcasters screen.

8. Add the Premium Positioning caster: Tap New, name it (e.g. 'Premium Positioning'), and enter IP addr (Host) rtkpremium.xyz, Port 2101.

9. Enter YOUR NTRIP credentials: In User and Pwd type the username/password from your Premium Positioning welcome email - unique to you; never use anyone else's.

10. Download the source table: Tap the green check. SurvCE/SurvPC downloads the broadcaster's base list (source table). If nothing returns, recheck internet, host/port, and credentials.

11. Select the COMMON mountpoint: On the Bases screen open the Name dropdown and choose 'COMMON', then tap the green check.

12. Confirm and apply: Tap the green check again to return to the RTK tab. Correction type/format fields are greyed out on purpose - with NTRIP it follows what the caster advertises. Exit GPS Rover with the green check to start streaming.

13. Verify a Fixed solution: Go to Survey > Store Points and watch the status progress Autonomous → Float → FIXED (typically within a minute or two). Wait for FIXED before storing points, then check on a known mark. If you sit on Float, recheck cellular signal, the COMMON mountpoint, and your credentials.

If the fix will not hold

Names differ slightly between SurvCE and SurvPC versions and firmware; the layout is the same (Equip > GPS Rover, RTK tab, Network = NTRIP, wrenches icon to add the caster). Some crews drive the S631/S321 from Hemisphere's PocketMax app instead - there the path is Config > GNSS Rover > Corrections > NTRIP Client; caster host/port/mountpoint and your credentials are identical. A stable cellular signal is required; if correction age climbs above ~5 s the link is unstable.

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.