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GeoSun GS-200G RTK Setup: GS-100G, GS-130G, GeosunMeasure

Connect GeoSun GS-100G, GS-130G and GS-200G handheld LiDAR to RTKdata in GeosunMeasure (formerly GnssMeasure): regional IP, port 2101, AUTO and fix check.

The GeoSun GS-100G, GS-130G and GS-200G are handheld SLAM LiDAR scanners from GeoSun's G-series with a built-in GNSS module. This GeoSun GS-200G RTK setup also applies to the GS-100G and GS-130G. All three scan in SLAM, RTK-SLAM or PPK-SLAM mode and are operated from an Android phone on the handle. For RTK-SLAM you enter the NTRIP settings in GeoSun's app GeosunMeasure (called GnssMeasure in 2024), and the phone provides the internet connection for the corrections.

GeoSun's own RTK setup video tells users to enter an IP address, not a domain name, in the app's IP Address field. This guide therefore puts the IP address first: RTKdata documents a fixed IP fallback for each regional server, and that address goes into RTK Settings:

Field
Value

IP Address, North America

13.56.117.10 (IP fallback of rtk.rtkdata.com)

IP Address, Europe

3.73.41.96 (IP fallback of eu.rtkdata.com)

IP Address, Australia

54.206.56.130 (IP fallback of aus.rtkdata.com)

Port Number

2101

Mount Point

AUTO, in capital letters (alternatives: AUTO_WGS84, AUTO_ITRF2020, AUTO_ITRF2014)

Account

NTRIP username from RTK Credentials in your account dashboard (starts with rtk), not your website login

Password

NTRIP password from RTK Credentials, not your website password

Select the tab for the RTKdata server closest to your work area:

  • Host (IP fallback): 13.56.117.10, in the field IP Address

  • Host (domain): rtk.rtkdata.com, for reference only: GeoSun asks for an IP address in IP Address

  • Port: 2101, in Port Number

  • Username / Password: From RTK Credentials in your account dashboard, not your website login, in Account and Password

  • Mountpoint (ALL CAPS): AUTO (recommended), or AUTO_WGS84, AUTO_ITRF2020, AUTO_ITRF2014, in Mount Point

  • Host (IP fallback): 3.73.41.96, in the field IP Address

  • Host (domain): eu.rtkdata.com, for reference only: GeoSun asks for an IP address in IP Address

  • Port: 2101, in Port Number

  • Username / Password: From RTK Credentials in your account dashboard, not your website login, in Account and Password

  • Mountpoint (ALL CAPS): AUTO (recommended), or AUTO_WGS84, AUTO_ITRF2020, AUTO_ITRF2014, in Mount Point

  • Host (IP fallback): 54.206.56.130, in the field IP Address

  • Host (domain): aus.rtkdata.com, for reference only: GeoSun asks for an IP address in IP Address

  • Port: 2101, in Port Number

  • Username / Password: From RTK Credentials in your account dashboard, not your website login, in Account and Password

  • Mountpoint (ALL CAPS): AUTO (recommended), or AUTO_WGS84, AUTO_ITRF2020, AUTO_ITRF2014, in Mount Point

Requirements

  • GeoSun GS-100G, GS-130G or GS-200G (GS-120G, GS-122G and GS-203G: see the model table below)

  • TF card inserted in the scanner

  • GS-100G and GS-130G: GNSS antenna fitted on top and the phone connected with the USB cable

  • Android phone with GeosunMeasure (formerly GnssMeasure) in the phone holder. The app is not in Google Play or the App Store, see the FAQ below.

  • Internet on the phone. GS-200G: mobile data (SIM with a data plan), because the phone's Wi-Fi is connected to the scanner.

  • RTKdata account with active RTK credentials (username starts with rtk)

  • RTKdata coverage at your site: check the coverage map before you go

  • Open sky where the scan starts and where it ends

App version shown on the start screen in GeoSun's GS-200G operation demo (July 2025): v2.1.0_20250711.1349. The app looks different by model and version: the GS-200G app (v2.1.0) has a Check tab and an Output absolute switch, while the USB app in GeoSun's 2024 and 2025 videos shows only the tabs Basic, RTK and Firmware.

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Which GeoSun handheld models does this guide cover?

This guide covers the GeoSun GS-100G and GS-130G, which pair with the phone over USB, and the GS-200G, which pairs over the scanner's Wi-Fi; all three take their RTKdata settings in GeosunMeasure.

Model
Pairs with the phone via
Status of the steps on this page

GS-100G

USB cable, USB Connect

Documented by GeoSun

GS-130G

USB cable, USB Connect

Documented by GeoSun

GS-200G (also written GS200)

Scanner Wi-Fi, WIFI Connect

Documented by GeoSun

GS-120G, GS-122G

Not documented

GeoSun lists them in the same G-series and shows the GS-120G with the app in its anchor collection video. GeoSun does not document how they pair.

GS-203G (listed as GS-203)

Not documented

GeoSun lists it with "GNSS RTK integrated". No manual or app screens published yet. The steps on this page come from GeoSun's documentation for the GS-100G, GS-130G and GS-200G.

For other scanners, see LiDAR Scanners & Mobile Mapping.

Why does GeosunMeasure need an IP address instead of a hostname?

GeosunMeasure gets an RTKdata IP address instead of a hostname because GeoSun instructs users to put an IP address, not a domain name, into the app's IP Address field: the on-screen captions of GeoSun's video How To Do the RTK Setting of our Handheld LiDAR on the GnssMeasure APP (September 2024) say "the IP mode don't input the string like the domain name".

The field keeps the label IP Address in the 2025 app and in the GS-200G manual, and every GeoSun example shows a numeric IP. GeoSun does not document what the app does with a hostname.

Other RTKdata guides enter the regional hostname (rtk.rtkdata.com, eu.rtkdata.com or aus.rtkdata.com). NTRIP Server Settings lists a fixed IP fallback next to each hostname and explains when to use it: "Some older Android controllers, tablets, and embedded systems cannot resolve DNS hostnames. If your device fails to connect using the hostname, enter the IP address instead." In GeosunMeasure you enter that IP fallback directly.

If the connection fails, compare the IP Address in the app with the values on this page.

Which RTKdata IP address do you enter?

Enter the IP address of the RTKdata server closest to your work area: 13.56.117.10 for North America, 3.73.41.96 for Europe or 54.206.56.130 for Australia, each with Port Number 2101 and Mount Point AUTO.

All three servers share the same global base station network, and the difference is routing latency, as NTRIP Server Settings explains. If you work outside these three regions, for example in Latin America, Africa, the Middle East or Asia, you also enter the IP address of the server closest to your work area. AUTO picks the base station and the regional datum from the scanner's position.

One login per connected device. One set of NTRIP credentials allows one connection at a time, so a scanner and a GNSS rover that are online together need one data stream each. See Account & Credentials.

Type the username and password rather than pasting them, with no spaces at the start or end. Credentials are case sensitive.

The RTKdata sourcetable loads without a login. If you test the address in another NTRIP app first, a visible mountpoint list proves neither that your credentials work nor that corrections flow (checked on 25 September 2026). In GeosunMeasure, only a rising RTCM counter shows that corrections arrive.

How do you enter GeoSun GS-200G RTK settings in GeosunMeasure?

In GeosunMeasure you tap the gear icon at the top right, open the RTK tab and enter your RTKdata values in every field of RTK Settings before you tap CONNECT. The same steps apply to the GS-100G and GS-130G; only the pairing differs.

1

Give the phone an internet connection

  • The phone needs internet for RTK. GeoSun's GS-200G manual: "Ensure your phone has network connectivity before using RTK."

  • GS-200G: the phone's Wi-Fi connects to the scanner, and the manual asks you to remove any other Wi-Fi connection on the phone. Office Wi-Fi, site Wi-Fi or a hotspot from another phone therefore cannot supply the internet. Use mobile data from a SIM with a data plan.

  • Check that the internet works in the phone's browser before you pair the scanner. A working browser does not prove that port 2101 is open: some mobile carriers block it, see NTRIP Server Settings.

2

Power on and pair the phone

  1. GS-100G, GS-130G: fit the GNSS antenna on top and connect the phone with the USB cable.

  2. Power on the scanner. GS-200G: hold the power button for 3 seconds; the power LED lights green and the Wi-Fi LED blinks. GS-130G: all four status LEDs light up together, then two stay lit.

  3. Open GeosunMeasure. On first start, allow location access with Precise location, as the GS-200G manual asks.

  4. Pair the phone:

    • USB models: wait until USB Connect turns blue, tap it and confirm the Android prompt with OK.

    • GS-200G: tap WIFI Connect, pick your scanner in the Device list (the entry ends in the last three digits of the serial number, for example AGS-200G-180) and confirm the Android dialog Connect to device with Connect.

  5. Wait for Connection successful and Initialization of parameters completed in the status bar.

GS-200G: keep the phone in the holder on the scanner. GeoSun's manual describes the Wi-Fi data link as smooth within 5 m.

3

Open RTK Settings

Tap the gear icon (Settings) at the top right and choose the RTK tab on the left. RTK Settings opens. The other tabs are Basic, Firmware and, in the GS-200G app (v2.1.0), Check.

4

Overwrite the pre-filled values and connect

The fields come pre-filled with another service's values (203.107.45.154, 8002, AUTO). Replacing only Account and Password leaves the app pointed at that service, so enter the values from the table at the top of this page in all five fields:

  • IP Address: the RTKdata IP address for your region (13.56.117.10, 3.73.41.96 or 54.206.56.130), replacing 203.107.45.154

  • Port Number: 2101, replacing 8002

  • Mount Point: AUTO, in capital letters. The pre-filled AUTO comes with the other service's settings and happens to match the RTKdata mountpoint name, so it can stay as long as it reads exactly AUTO. Enter AUTO_WGS84 or AUTO_ITRF2020 here only if the project stays in WGS84 or ITRF (see PointCloudCreater below).

  • Account and Password: your NTRIP credentials from RTK Credentials, typed, with no spaces at the start or end

Leave Output absolute at its default (off) unless you need a coordinate file on the phone. According to GeoSun's manual, the switch writes absolute RTK coordinates to Internal Storage/Documents/Geosun/mobile/project/[Project_Name]/RtkCoord on the phone, not to the scanner's card.

Tap CONNECT. The app returns to the main view and shows RTK server connection successful (the manual words it RTK Service Connected Successfully). If it stays in Settings, tap RETURN.

The success message only shows that the app reached the server. It does not prove that your credentials, the mountpoint or the corrections are right, and it appears while the status bar still shows Satellites:0. The AUTO mountpoint picks the base station from the scanner's position (NMEA GGA). Without a position the login still succeeds, but no corrections arrive, see NTRIP & GGA Essentials. RTK Settings has no GGA option, and GeoSun does not document whether GeosunMeasure sends the position. Work under open sky so the scanner can get its own position, and check the result in the next section: a rising RTCM counter and RTK:Fixed Solution.

How do you know corrections arrive and the scanner is fixed?

RTKdata corrections arrive when the RTCM counter in the GeosunMeasure status bar keeps rising, and the GeoSun scanner is fixed when the status bar shows RTK:Fixed Solution instead of RTK:Single Point. Check both at Device Ready, before you start walking.

Status bar item
What to look for

RTCM

Counter for incoming correction data. It has to rise during initialization, after Device Start.

Diff Age

Age of the corrections. GeoSun and dealer videos show 00 to 03 at a fix.

Satellites

Satellite count. 0 right after CONNECT is normal; GeoSun and dealer videos show 20 to 27 at a fix.

RTK:Single Point / RTK:Fixed Solution

Solution status. Start walking only when RTK:Fixed Solution shows and the scanner is ready: Device Ready on the GS-200G (about 40 s), the T LED solid on the USB models (about 80 to 90 s).

In GeoSun's GS-130G video the status bar reads RTCM:102 Device Ready, then Diff Age:03 Satellites:20 RTK:Fixed Solution.

Read the status bar before you start walking, not during the scan. In the scanning footage of GeoSun's GS-130G video, the status bar shows RTCM:0 and RTK:Single Point during Device Scanning.... GeoSun does not document whether this is only a display state, so the status bar during the scan is not a reliable fix check.

1

Start a project in Outdoor mode

  1. Hold the red button on the right.

  2. Enter Project Name and Engineering Name. Both are required and accept only letters, numbers and underscores, for example Site_01. Tap Confirm.

  3. Choose Outdoor (Garden, Natural Scenery). GeoSun recommends Outdoor for RTK and PPK. The app sends the start command and shows Device Start.

2

Hold still until Device Ready and RTK:Fixed Solution

  • Set the scanner down and keep it still during initialization:

    • GS-200G: about 40 seconds, until Device Ready and the message "The equipment is ready. Please start the dynamic measurement."

    • USB models: about 80 to 90 seconds, until the T LED stays solid. In GeoSun's GS-100G CORS setup video, the speaker says to wait about 80 seconds and then another 60 seconds.

  • In RTK mode the scanner counts as initialized only when RTK:Fixed Solution shows (GeoSun). Watch the RTCM counter rise while you wait.

  • The first RTK:Fixed Solution alone is not the signal to go. Keep still until the fix and the ready signal (Device Ready or the solid T LED) both show.

3

Scan and finish

  • Short RTK dropouts of less than 30 seconds can generally still be resolved, according to GeoSun's GS-100G usage instructions. Plan the route so that GNSS shadows under buildings or through passages stay shorter.

  • GeoSun's GS-200G manual recommends recordings of up to 30 minutes and, for large areas, blocks with at least 25% overlap.

  • If the route moves from outdoors into a building, GeoSun's GS-200G manual says to choose the indoor mode when you process the data.

  • End the scan where there is GNSS reception, not in a hall, an underground car park or an underpass. The GS-100G usage instructions warn that shutting down after moving from GNSS reception into an area without it leaves data that cannot be resolved.

  • Stop recording by holding the red button until the app reports that the project is completed (GS-200G manual and GeoSun's GS-130G video).

  • In RTK mode, close GeosunMeasure first, then power off the scanner (GS-100G usage instructions).

Why does GeosunMeasure connect but the GS-200G gets no RTK fix?

When GeosunMeasure connects but the scanner gets no RTK fix, check the RTCM counter first: if it does not rise, no corrections arrive (no position yet, a pre-filled value, the mountpoint or the credentials); if it rises but the status stays RTK:Single Point, look at the sky view and the antenna. The table also covers pairing and project errors on the GS-200G, GS-100G and GS-130G.

Problem
Likely cause
Fix

No success message after CONNECT

No internet on the phone, a mobile carrier that blocks outbound port 2101 (see NTRIP Server Settings), a wrong IP Address or Port Number, or website login instead of NTRIP credentials

Check the phone's internet connection (GS-200G: mobile data, no other Wi-Fi). Check the IP address for your region and port 2101. Re-type the credentials from RTK Credentials. If all values are right, try a different network; on the GS-200G that means mobile data from another carrier.

Success message, but RTCM does not rise

No position from the scanner yet (obstructed sky, Satellites:0), a pre-filled value left in a field, Mount Point not exactly AUTO, or website login instead of NTRIP credentials

Move under open sky and check the Satellites count first. Then overwrite IP Address and Port Number again, check that Mount Point reads AUTO in capital letters, re-type the credentials from RTK Credentials and tap CONNECT again. If the counter still stands, send support@rtkdata.com the time of the attempt and your NTRIP username.

RTCM rises, but the status stays RTK:Single Point

Obstructed sky, or no GNSS antenna fitted on a USB model

Start in open sky, check the antenna, and keep the scanner still until the fix. If it persists under open sky with the antenna fitted, send support@rtkdata.com the scanner model; see Correction format in NTRIP & GGA Essentials.

RTK Settings has no IP Address or Port Number field

Older app version

Ask your GeoSun sales representative or engineer for the current GeosunMeasure version.

The GS-200G does not appear in the Device list

Possible cause: location access. GeoSun's manual asks you to allow Precise location on first start.

Allow Precise location for GeosunMeasure in the Android settings and reopen the app.

The red button does not open a new project

No TF card inserted. In the GS-200G app, the Check tab reports TF Card Not Detected - Project creation disabled

Insert the TF card. In the GS-200G app, open the Check tab again to confirm.

The project name is rejected

Spaces or special characters

Use only letters, numbers and underscores.

Corrections stop when a second device connects

Two devices on one set of credentials

One connection per data stream. See Account & Credentials.

For more checks when the login works but no corrections arrive, see Fix NTRIP Connection Issues.

Which coordinate settings do you use in PointCloudCreater?

For a delivery in your national system, connect with the RTKdata AUTO mountpoint and, in PointCloudCreater (PCC), GeoSun's Windows processing software, only project the result and declare it in the regional datum that AUTO delivers, for example ETRS89 (realization ETRF2000) in Europe, NAD83(2011) in the USA or GDA2020 in Australia. Use AUTO_WGS84 or AUTO_ITRF2020 only for projects that stay in a global frame.

PCC sets the output under Coordinate with Coor. System (WGS84 Gauss Local, WGS84 Gauss 3-Degree, WGS84 Gauss 6-Degree, WGS84 UTM, AnchorSys or a user-defined system) and Coor. Format (ENH), as GeoSun shows in its PPK-SLAM guide.

Choose the mountpoint by the frame of your delivery, and keep one mountpoint per project.

  1. Mountpoint AUTO for deliveries in your national system: RTKdata delivers your region's datum, for example NAD83(2011) in the USA, NAD83(CSRS)v7 in Canada, ETRS89 (realization ETRF2000) in Europe and GDA2020 in Australia. Coordinate Systems & Datums lists the datum and epoch for every region; for regions not listed there, AUTO falls back to WGS84(G2139) at the mid-year epoch. In PCC, only project and declare the delivery in that regional datum, even if PCC names the system WGS84 UTM.

  2. Mountpoint AUTO_WGS84 or AUTO_ITRF2020 only if the project stays in WGS84 or ITRF, for example when you merge the scan with global-frame data. AUTO_WGS84 delivers WGS84(G2139) in the middle of the current year, AUTO_ITRF2020 delivers ITRF2020 at the current epoch. GeoSun's PCC videos show ellipsoid and projection settings but no choice of datum realization (ITRF, ETRS89, NAD83), so do not rely on PCC to convert a global-frame scan to your national datum.

AUTO_ITRF2014 (ITRF2014 at the current epoch) is also available for projects in ITRF2014. A consistent offset of 50 cm to 1 m against local control usually means a datum mismatch. GeoSun does not document whether PCC uses the real-time RTK solution for RTK-SLAM processing, so check one known control point before delivery.

  • Install PCC on a drive other than C: or run it as administrator. GeoSun's support FAQ reports that on drive C (Windows 10 and later) the coordinate system falls back to WGS84 after you save it as default, or the software crashes when you change it. Check the selected system before every calculation.

  • Set the start position in Shuttle. In GeoSun's anchor processing tutorial, Tools > Shuttle > Configuration, tab INS, the fields Original Latitude (deg) and Original Longitude (deg) are preset to 30 and 114, and GeoSun changes them to the local latitude and longitude.

  • Replace the China presets in the projection. In the same tutorial, the Coordinate system conversion tool starts with the target CGCS2000 and Lon of natural origin 114. GeoSun sets the source and target ellipsoid to WGS84 and the central meridian to the local longitude. For a national grid, enter every parameter of its published definition, not only the local longitude; see Building a Projection by Hand in Coordinate Systems & Datums.

  • Anchor points from a separate GNSS rover: connect the rover to the same RTKdata mountpoint as the scanner.

For the datum choice in SLAM point clouds in general, including WGS84 labels in scanner software, see Georeference SLAM Point Clouds with RTK.

RTKdata corrections deliver ellipsoidal heights, not heights above mean sea level. GeoSun does not document whether PCC outputs ENH heights as ellipsoidal heights or applies a geoid, so compare the result with a control point of known height. See Understanding Heights.

Frequently asked questions

How do I connect a GeoSun GS-200G to an NTRIP RTK service?

Pair the GS-200G with GeosunMeasure over WIFI Connect, open the gear icon, choose the RTK tab, fill in IP Address, Port Number, Mount Point, Account and Password, overwriting the pre-filled 203.107.45.154 and 8002, and tap CONNECT. Then start a project and hold the scanner still until Device Ready and RTK:Fixed Solution both show. For RTKdata the values are the IP address of the server closest to your work area (North America 13.56.117.10, Europe 3.73.41.96, Australia 54.206.56.130), port 2101 and mountpoint AUTO. The phone needs mobile data, because its Wi-Fi is connected to the scanner.

Can I enter a hostname in the GeosunMeasure IP Address field?

GeoSun advises against it: its RTK setup video tells users not to enter a domain name in the IP Address field. In GeosunMeasure, enter the IP fallback that RTKdata documents for the regional server instead: 13.56.117.10 for North America (rtk.rtkdata.com), 3.73.41.96 for Europe (eu.rtkdata.com) or 54.206.56.130 for Australia (aus.rtkdata.com). GeoSun does not document what the app does with a hostname.

Why does GeosunMeasure say RTK server connection successful but I get no fix?

RTK server connection successful only shows that the app reached the server. It does not prove that your credentials, the mountpoint or the corrections are right, and it appears while the status bar still shows Satellites:0. Corrections arrive only when the RTCM counter rises, and the scanner is fixed only at RTK:Fixed Solution; read both at Device Ready, before you start walking. With RTKdata, the AUTO mountpoint needs the scanner's position before corrections flow, so work under open sky and check that IP Address shows the RTKdata server for your region (13.56.117.10, 3.73.41.96 or 54.206.56.130), Port Number 2101 and Mount Point exactly AUTO. Re-type Account and Password from RTK Credentials, not your website login. GeoSun describes a GS-100G support case without a fixed solution that was solved by changing the mountpoint.

Where do I get the GeosunMeasure app?

GeosunMeasure (formerly GnssMeasure) is not in Google Play or the Apple App Store under either name (checked on 25 September 2026). GeoSun says: "If you've purchased our SLAM LiDAR, our technical team will assist you with the app installation." GeoSun also says you can ask your designated sales representative or engineer for the latest download link. GeoSun documents the app for Android phones. Once installed, the RTKdata settings go into RTK Settings as described above.

Does the GeoSun GS-203G have built-in RTK?

GeoSun's listing of the GS-203G describes it as integrating LiDAR, GNSS and INS, building on the GS-200G, and states "GNSS RTK integrated: Yes". GeoSun has not published a manual or app screens for the GS-203G yet, so its app and pairing are not confirmed. The steps on this page come from GeoSun's documentation for the GS-100G, GS-130G and GS-200G. Until GeoSun documents the GS-203G, the RTKdata connection values on this page apply: the IP address for your region, port 2101, mountpoint AUTO and your NTRIP credentials.

Related Guides

Quick reference

  1. Phone: GeosunMeasure (formerly GnssMeasure) on Android with internet (GS-200G: mobile data, no other Wi-Fi).

  2. Pair: USB Connect (GS-100G, GS-130G) or WIFI Connect (GS-200G), then gear icon > RTK > RTK Settings.

  3. Values: IP Address 13.56.117.10 (North America, rtk.rtkdata.com), 3.73.41.96 (Europe, eu.rtkdata.com) or 54.206.56.130 (Australia, aus.rtkdata.com), Port Number 2101, Mount Point AUTO, Account and Password from RTK Credentials, then CONNECT.

  4. Fix: new project in Outdoor (Garden, Natural Scenery), hold still until RTK:Fixed Solution shows and the scanner is ready (GS-200G: Device Ready, about 40 s; USB models: T LED solid, about 80 to 90 s), with the RTCM counter rising. Check before you start walking, not during the scan.

  5. PCC: AUTO with the regional datum declared for deliveries in your national system; AUTO_WGS84 or AUTO_ITRF2020 only for projects that stay in WGS84 or ITRF; check a control point.

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