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Emlid Reach RX / RX2 NTRIP Setup: RTK Corrections

Step-by-step guide to connecting Emlid Reach RX and RX2 to RTKdata via NTRIP in Emlid Flow. Covers iOS and Android setup including mock location configuration

The Emlid Reach RX and RX2 are compact, lightweight multi-band GNSS receivers built for GIS data collection and mapping. Unlike the RS2+ which has a built-in antenna, the RX series is a small receiver module that pairs with an external antenna or attaches to a survey pole. It connects to your phone or tablet exclusively via Bluetooth, and the phone handles the internet connection for NTRIP corrections. The RX tracks GPS, GLONASS, Galileo, and BeiDou. The RX2 adds QZSS and L5 support for faster convergence.

Requirements

  • Emlid Reach RX or RX2 with a compatible GNSS antenna

  • Emlid Flow app installed on your phone or tablet (iOS or Android)

  • Internet connection on your phone (cellular data)

  • RTKdata.com account with active RTK credentials

  • Survey pole or mounting bracket for the antenna

  • Note for iOS users: You need the MFi-certified revision of the RX/RX2 for iOS Bluetooth compatibility. Check your device packaging or Emlid support if unsure.

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Step-by-step setup

1

Power on and pair via Bluetooth

  1. Press the power button on the RX/RX2. The LED will begin blinking.

  2. Open the Emlid Flow app.

  3. Tap + Add new device. The app scans for nearby Emlid devices via Bluetooth.

  4. Select your Reach RX or Reach RX2 from the list.

  5. If prompted, confirm the Bluetooth pairing on your phone.

  6. Once connected, the device dashboard appears showing satellite tracking status.

2

Configure correction input

  1. Tap Correction input in the left-side menu.

  2. Toggle correction input On if it is not already enabled.

  3. Select NTRIP as the correction type.

  4. Tap Add new NTRIP profile.

3

Enter RTKdata.com NTRIP settings

Fill in the fields. Select the tab for your region:

  • Host (domain): rtk.rtkdata.com

  • Host (IP fallback): 13.56.117.10

  • Port: 2101

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

  • Mountpoint (ALL CAPS): AUTO (recommended) — or AUTO_WGS84, AUTO_ITRF2020, AUTO_ITRF2014

Also configure:

  • Send receiver position to the correction service: Enabled

Tap Save.

Only these four mountpoints are valid. Always use ALL CAPS.

4

Connect and verify

  1. Tap Connect on your saved profile.

  2. The correction input status changes to Connected.

  3. Monitor the solution: Single → Float → Fix.

5

Set up mock location (Android)

The RX/RX2 outputs corrected positions to your field app via mock location on Android. This makes every app on your phone use the centimeter-level position from the RX instead of the phone's built-in GPS.

  1. On your Android phone, go to Settings → About phone and tap Build number 7 times to enable Developer Options.

  2. Go to Settings → Developer Options → Mock location app.

  3. Select Emlid Flow as the mock location provider.

  4. Open your field app (ArcGIS Field Maps, Mergin Maps, QField, SW Maps, etc.). It will now receive the corrected RTK position automatically.

On iOS, mock location is not available. Instead, select the RX/RX2 as an external Bluetooth GNSS source directly in your field app's location settings.

What to expect

  • LED indicators: Solid green = powered on and tracking. Blinking blue = Bluetooth connected. The LED does not directly indicate Fix status — check the app.

  • Convergence time: Typically 15–60 seconds to Float, then 30–90 seconds to Fix with good sky visibility.

  • Accuracy at Fix: 1–2 cm horizontal, 2–4 cm vertical.

  • Battery life: Approximately 8–10 hours (RX) or 10–12 hours (RX2) with Bluetooth and NTRIP active.

Vertical reference (heights)

Heights from RTKdata.com are ellipsoidal, not orthometric (mean sea level). If your project requires MSL heights, apply a geoid model in your GIS software or use Emlid Flow's geoid settings.

Troubleshooting

Problem
Cause
Fix

RX not appearing in Emlid Flow

Bluetooth not enabled or device out of range

Ensure Bluetooth is on. Keep the RX within 10 meters. Restart Bluetooth on your phone if needed.

NTRIP connects but solution stays Single

GGA not being sent

Verify Send receiver position is toggled on in the NTRIP profile.

Float but no Fix after several minutes

Obstructed sky or multipath

Move away from buildings, metal structures, and dense tree cover.

Field app not receiving corrected position

Mock location not configured

On Android, enable Developer Options → Mock location app → Emlid Flow. On iOS, use the Bluetooth GNSS method in your field app.

"Authentication failed" error

Wrong credentials

Use the username and password from your RTK dashboard, not your RTKdata.com website login.

Tips and tricks

  • The RX2 converges faster than the RX due to additional L5 tracking. If you frequently work in challenging environments, the RX2 is worth the upgrade.

  • Bluetooth range is about 10 meters. Keep your phone in a pocket or chest mount rather than leaving it in your vehicle.

  • Antenna matters. The RX/RX2 accuracy depends heavily on the external antenna quality. Use the Emlid-recommended survey antenna for best results.

  • Save multiple NTRIP profiles if you work across regions — one for EU, one for NA, etc. Switch between them with a single tap.

  • Enable logging for PPK backup. If corrections drop, you can post-process the raw data against RTKdata RINEX files.

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