How to set up Emlid Reach RS2+ with NTRIP corrections

The Emlid Reach RS2+ connects to any NTRIP correction service in under two minutes using Emlid Flow. This guide walks you through every step — from first power-on to RTK Fixed — and covers the most common pitfalls along the way.

Before you start

Requirements

Emlid Reach RS2+ fully charged (or connected to power via USB-C)
Emlid Flow app installed on your phone — Android or iOS, latest version
NTRIP credentials: host address, port number, mountpoint name, username and password
Mobile data on your phone, or a Wi-Fi connection with internet access
Clear sky view — go outside before connecting

RS2+ vs RS3 vs RS4

The steps in this guide apply to the entire Emlid Reach RS family — RS2+, RS3 and RS4 all use the same Emlid Flow app and the same NTRIP setup process. The only difference is that the RS3 and RS4 support additional constellations and frequencies. Select your exact model when prompted in Emlid Flow for the correct antenna calibration.

Step 1 — Power on and connect in Emlid Flow

Power on the RS2+
Press and hold the power button until the LED indicator turns on. The RS2+ boots in approximately 20 seconds. During boot the LED pulses white, then settles into a steady or slow-pulsing blue — indicating it is broadcasting a Wi-Fi hotspot.
Connect your phone to the RS2+ hotspot
Go to your phone's Wi-Fi settings and connect to the RS2+ hotspot — named something like reach:xx:xx. The default password is emlidreach.
Alternatively, if you have already paired the RS2+ to your phone's hotspot in a previous session, turn on your phone's hotspot first and the RS2+ will connect to it automatically. This is the preferred setup for field use because the phone retains its mobile data connection.
Open Emlid Flow and connect to the receiver
Open Emlid Flow. The app automatically discovers RS2+ units on the same network. Tap your receiver in the device list to connect. The main screen shows satellite count, solution status and battery level.

Use phone hotspot for field work

Connect the RS2+ to your phone's hotspot rather than using the RS2+ as the hotspot. This way the phone keeps its mobile data connection and the RS2+ uses it for NTRIP — one connection handles everything. In Emlid Flow, go to Settings → Wi-Fi on the receiver to add your phone hotspot as a known network.

Step 2 — Configure correction input

Open Correction input
In Emlid Flow, tap the Correction input tab (the antenna icon at the bottom of the screen, or in the receiver settings). This is where you configure how the RS2+ receives RTK corrections.
Set the source to NTRIP. Other options — LoRa radio and Bluetooth — are used for base-rover setups and are not relevant for NTRIP.

Step 3 — Enter NTRIP credentials

Add a new NTRIP profile
Tap Add profile (or edit an existing one). Fill in the connection details from your correction service. For RTKsub:
Hostntrip.rtksub.com
Port2101
Usernameyour username
Passwordyour password
Tap Request mountpoints. Emlid Flow connects to the server and retrieves the list of available mountpoints.

Step 4 — Select mountpoint

Choose the right mountpoint for your RS2+
From the sourcetable, select the mountpoint that matches your situation:
Standard (<30 km)RTCM3_NL
Long baseline (>30 km)RTCM3_NL_VRS
High-end surveyRTCM3_NL_MSM7 (works, but MSM4 is sufficient)
The RS2+ processes MSM4 and MSM7 equally well. Start with RTCM3_NL (MSM4). Only switch to VRS if your working area is more than 30 km from the nearest physical reference station.
Enable GGA if using VRS
If you selected RTCM3_NL_VRS, enable the Send GGA to caster toggle. This sends your approximate position to the server so it can generate a virtual station near you. Without it, VRS returns zero data.
For standard mountpoints like RTCM3_NL, GGA is optional — leave the toggle off.

Step 5 — Connect and verify RTK Fix

Tap Connect and go outside
Tap Connect. Emlid Flow connects to the NTRIP server and begins streaming corrections to the RS2+. The correction counter (bytes per second) in the Correction input tab should start incrementing — confirming data is flowing.
Make sure you are outside with a clear sky view. The RS2+ cannot achieve RTK Fix indoors or under heavy canopy.
Watch the solution status
The solution status progresses through three stages:
Single
Satellite lock, no corrections yet. Accuracy 2–5 m.
Float
Corrections received, ambiguities not yet resolved. Accuracy 0.1–1 m.
Fixed
Full RTK Fix. Centimetre accuracy. Ready to work.
Emlid Flow — Status
Solution
StatusRTK FIXED
Satellites24
PDOP1.2
Corrections
SourceNTRIP
MountpointRTCM3_NL
Data rate1.2 KB/s
Position (WGS84)
Latitude52.3745°N
Longitude4.8979°E
Height25.41 m
In good sky conditions with a nearby reference station, Fix typically arrives within 10–60 seconds. If it takes longer, see the troubleshooting section below.

Step 6 — Use with field software

Once the RS2+ has RTK Fix, connect it to your survey or mapping software to collect and stake out points.

Emlid Flow includes a built-in survey module. Once Fix is achieved, tap Survey at the bottom of the screen to start collecting points, lines and areas. Set the antenna height (to the bottom of the receiver), configure your coordinate system and begin.

For stakeout, tap Stakeout and import your design points from a CSV or DXF file. Emlid Flow guides you to each point with a real-time directional indicator.

Connect the RS2+ to your controller over Wi-Fi or Bluetooth, then configure it as the active GNSS receiver in the instrument settings. The RS2+ supplies the RTK position once it has Fixed.

Connect the RS2+ as a Bluetooth GNSS receiver in SW Maps. Keep NTRIP configured in Emlid Flow, then use the Fixed solution from the receiver in the mapping app.

Configure the RS2+ as the external GNSS receiver and select the correct coordinate reference system for the project. Verify that QField reports RTK Fixed before collecting data.

Troubleshooting

Problem	Likely cause	Fix
Cannot request mountpoints	No internet on RS2+, wrong host or port	Ensure RS2+ is connected to a network with internet (your phone hotspot). Verify host is `ntrip.rtksub.com`, port `2101`. No `http://` prefix.
Credentials rejected	Wrong username or password	Copy-paste credentials from your RTKsub account dashboard. Check for leading or trailing spaces.
Connected but 0 bytes/sec	VRS mountpoint with no GGA sent	Enable Send GGA to caster in the NTRIP profile. Wait for a Single solution before connecting.
Stuck on Float for more than 3 minutes	Long baseline, obstructions or high PDOP	Switch to `RTCM3_NL_VRS` with GGA enabled. Move to open sky. Check satellite count — it should be 20+.
Fix drops when moving	Obstructions or multipath	Hold pole vertical. Move away from trees and buildings. Lower elevation mask to 10° in Emlid Flow GNSS settings.
Coordinates offset by 0.5–2 m	Datum transformation not applied	For Netherlands: verify RDNAPTRANS™ 2018 is applied in your job's coordinate system.
Heights wrong by ~40 m	Ellipsoidal height, no geoid model	Apply NLGEO2018 in the coordinate system settings. Ellipsoidal height differs from NAP by 38–44 m.
RS2+ not found in Emlid Flow	Not on the same network	Connect your phone to the RS2+ hotspot, or ensure both are on the same Wi-Fi network. Restart Emlid Flow.

Save the profile for next time

Once your NTRIP profile is configured and working, Emlid Flow saves it automatically. On your next job, simply tap the profile, tap Connect, and you are ready. The entire process takes under 30 seconds from power-on to Fix in good conditions.