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Trimble Unity NTRIP Setup: Source Field & TMM

Set up RTKdata NTRIP corrections in Trimble Unity. Enter host, port 2101 and type the AUTO source manually, or route corrections via Trimble Mobile Manager.

Trimble Unity is Trimble's asset lifecycle management platform for utilities, municipalities, and public infrastructure operators. Office teams use the Unity web app to manage assets, work orders, and GIS data, while field crews use the Unity mobile apps (Unity Field, Unity Mobile) to inspect assets, capture locations, and close out work orders offline.

Because Unity captures asset positions that end up in a GIS of record, centimeter accuracy matters. Unity takes its position from a connected GNSS receiver, and that receiver needs an RTK correction stream. This guide shows how to point Unity at RTKdata.com.

Requirements

  • Trimble Unity account with admin rights. The GPS configuration is created in the Unity web app and requires admin credentials.

  • GNSS receiver supported by your Unity deployment (for example a Trimble R-series receiver, or a Catalyst DA2).

  • Mobile device running the Unity mobile app, with the receiver paired.

  • Internet access on the field device (cellular data or hotspot).

  • Active RTKdata.com account with RTK credentials (username starts with rtk, taken from RTK Credentials in the internal dashboard, not your website login).

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Unity ships in several modules (Work Management, Field, Maintain, AMS) and the positioning screens differ slightly between them and between releases. Labels below follow Trimble's published GPS configuration documentation. If your build words a field differently, match it by function: an address field, a port field, a source or mountpoint field, and a credentials pair.

Step-by-step setup

1

Create a positioning configuration in the Unity web app

  1. Log in to the Trimble Unity web app with admin credentials.

  2. Open the menu and click GPS Config.

  3. Click Create Config (top right).

  4. Enter a name in Positioning Configuration Name, for example RTKdata.

  5. Choose your receiver in the Connection Type dropdown (external receivers appear as entries such as External: R2).

  6. Under Antenna Settings, set Pole Height(Meters) if you work off a survey pole.

2

Select NTRIP as the correction source

Under Real Time Correction, select NTRIP in the Primary Correction dropdown.

Prefix the address with http://. Trimble's own documentation states: "If you are using NTRIP correction source, make sure you prefix the server URL or IP address with http://." Unity will not resolve a bare hostname. Enter http://rtk.rtkdata.com, not rtk.rtkdata.com.

3

Enter the RTKdata connection details

Select your region and enter the matching values:

  • Server / caster address: http://rtk.rtkdata.com

  • IP fallback: http://13.56.117.10

  • Port: 2101

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

  • Source / Mountpoint (ALL CAPS): AUTO (recommended). Alternatives: AUTO_WGS84, AUTO_ITRF2020, AUTO_ITRF2014

  • Server / caster address: http://eu.rtkdata.com

  • IP fallback: http://3.73.41.96

  • Port: 2101

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

  • Source / Mountpoint (ALL CAPS): AUTO (recommended). Alternatives: AUTO_WGS84, AUTO_ITRF2020, AUTO_ITRF2014

  • Server / caster address: http://aus.rtkdata.com

  • IP fallback: http://54.206.56.130

  • Port: 2101

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

  • Source / Mountpoint (ALL CAPS): AUTO (recommended). Alternatives: AUTO_WGS84, AUTO_ITRF2020, AUTO_ITRF2014

RTKdata streams standard RTCM 3.2 corrections over NTRIP, so no proprietary Trimble format (VRS, iMAX, CMRx) is involved.

4

Type AUTO into the Source field

Type AUTO into the Source field in ALL CAPS and leave it there. You can also press Get Source and select it from the list. Do not clear the field if it turns red. See The Source field and the short mountpoint list below.

Click Save (top right).

5

Connect on the mobile device and verify Fix

  1. Open the Unity mobile app and log in.

  2. Tap the Settings icon, then GPS.

  3. Tap Positioning Configuration and select the profile you created.

  4. Tap Pole Height and adjust if needed.

  5. Tap GPS Receiver, then Connect.

  6. Go outdoors with a clear view of the sky and tap Location Status to watch the solution.

Status
Meaning

SINGLE / Autonomous

Basic GNSS position, no corrections applied yet

FLOAT

Corrections arriving, solution converging

FIX

Centimeter-level accuracy active

Convergence typically takes 5 to 60 seconds in open sky.

The receiver must be outdoors before corrections can work. RTKdata selects the best base station from the position your receiver reports (GGA). Indoors, the receiver has no position to report, so no corrections are sent and you stay on SINGLE. Unity does not expose a separate "send GGA" toggle, the receiver handles this once it has a satellite position. See NTRIP & GGA Essentials.

The Source field and the short mountpoint list

When you press Get Source, Unity downloads the caster's source table and validates whatever is in the Source field against it before saving.

RTKdata publishes a source table, and it is deliberately short. AUTO is the entry to type, in ALL CAPS, with the reference-frame variants available when a project is tied to a specific frame. A coordinate system name is never a valid Source. What you will not find in the table is a list of individual base stations, because you are not meant to pick a station at all:

  • RTKdata picks the best station for you. The AUTO mountpoint is resolved server-side from the position your receiver reports, and the caster assigns the best available base station for where you are standing.

  • No guesswork from a dropdown. On networks that publish hundreds of stations, the operator has to guess which one is nearest, healthiest and on the right reference frame. Nothing in such a list tells you which station is having a bad day.

  • It follows the crew. Move to the next job and the assignment updates automatically. There is no stale mountpoint in a saved profile that quietly keeps pulling from a base 80 km away.

If the list comes back empty, the caster address is the first thing to check: Trimble requires the http:// prefix on NTRIP sources, so enter http://rtk.rtkdata.com rather than the bare hostname. Typing AUTO manually into the Source field in ALL CAPS is always valid, whether or not the list populated.

If your Unity build hard-blocks Save while the Source field is flagged, use the Trimble Mobile Manager route below. That is Trimble's documented path for external receivers anyway, and it takes the correction setup out of Unity entirely.

Alternative: route corrections through Trimble Mobile Manager

For external GNSS receivers, Trimble documents the correction setup as living outside the Unity app: "This connection is configured outside of the Trimble Unity Field app using Trimble Mobile Manager (TMM)." Unity then simply consumes the corrected position that TMM provides.

This is the most reliable route with RTKdata, because TMM accepts a manually typed mountpoint.

  1. Install Trimble Mobile Manager on the same device and connect your receiver.

  2. In TMM, open Configuration and set the GNSS correction source to Custom local.

  3. Set Protocol to NTRIP.

  4. Enter the RTKdata URL and Port (2101) for your region from the tabs above.

  5. Set the corrections service username and password from your RTKdata RTK credentials.

  6. Enter the mountpoint AUTO in ALL CAPS instead of picking from the mount point table.

  7. For the GNSS source reference frame, select the frame matching the AUTO variant you chose, or Auto if unsure.

  8. In Unity, go to Settings > GPS and turn on the Trimble Mobile Manager toggle ("Turn on to enable Trimble Mobile Manager's positioning configuration").

With the TMM toggle enabled, Unity's own Antenna Height field becomes unavailable, because pole height and antenna settings are then managed in TMM. Set them there instead.

Catalyst Free will not accept a third-party caster. If you use a Trimble DA2 with a Catalyst Free subscription, configuration changes in TMM are not applied and RTKdata corrections will not reach the receiver. You need at least a Catalyst Basic subscription. See Trimble Receivers with RTKdata.

Vertical reference (heights)

Heights from RTKdata.com are ellipsoidal, not orthometric (mean sea level). If your Unity workflow records elevations against a vertical datum, apply the appropriate geoid model. In Trimble Mobile Manager this is set under Configuration > Geoid.

Troubleshooting

Problem
Cause
Fix

"Unable to populate source" / Source list is empty after Get Source

Caster address entered without the http:// prefix, so Unity never reaches the source table

Enter http://rtk.rtkdata.com (or your regional host) and press Get Source again. Typing AUTO in ALL CAPS directly into the Source field also works.

Source field highlights red on Save

Unity validated the Source against a source table it did not receive

Check the http:// prefix and the port (2101), then retry. The value AUTO itself is correct. If Unity still hard-blocks the save, configure corrections in Trimble Mobile Manager instead.

"Source is not valid", save rejected

Same as above

Retry with the prefix, or use the Trimble Mobile Manager route, where the mountpoint is typed manually.

Cannot find a "send GGA" or "send position" option

Unity does not expose a GGA toggle, the receiver sends position once it has a satellite fix

Take the receiver outdoors with clear sky. No manual toggle is required.

Connects but stays on SINGLE or FLOAT

Receiver indoors or under canopy, so no position is reported to the caster

Move to open sky. Confirm the receiver has satellite lock in Location Status.

Cannot reach the caster at all

Address entered without the http:// prefix

Enter http://rtk.rtkdata.com (or your regional host). Trimble requires the prefix for NTRIP sources.

Authentication fails

Website login used instead of RTK credentials

Use the RTK Credentials from the internal dashboard. The username starts with rtk and is case-sensitive.

Corrections never apply on a DA2

Catalyst Free subscription blocks third-party correction sources

Upgrade to at least Catalyst Basic, or use a receiver that accepts external NTRIP directly.

Field crew works but office profile does not

Positioning configuration not assigned or not selected on the device

On the device, check Settings > GPS > Positioning Configuration and select the RTKdata profile explicitly.

Tips for best results

  • Roll out one profile. Create a single RTKdata positioning configuration with AUTO and assign it to the whole crew. Because AUTO is position-resolved, the same profile is correct everywhere in the region.

  • Never browse for mountpoints. Typing AUTO in ALL CAPS is the supported path on every Trimble product, not a workaround.

  • Remember the http:// prefix. It is the single most common reason a Unity NTRIP source silently fails to connect.

  • Test the profile on one device outdoors before pushing it to the full crew, so you validate credentials and sky view separately from the configuration itself.

  • If Unity fights you, use TMM. Trimble itself documents Trimble Mobile Manager as the configuration point for external GNSS receivers with Unity Field.

Related Guides

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