# Emlid Flow

Emlid Flow is the official companion app for Emlid GNSS receivers, including the Reach RS2+, Reach RS3, Reach RX, and Reach RX2. Available on both iOS and Android, it handles receiver configuration, NTRIP correction input, data collection, and project management. When paired with an RTKdata.com subscription, Emlid Flow streams real-time corrections to your receiver for centimeter-level RTK positioning.

**Download:** [App Store (iOS)](https://apps.apple.com/app/emlid-flow/id1463967138) | [Google Play (Android)](https://play.google.com/store/apps/details?id=com.emlid.flow)

## Requirements

* Emlid receiver (Reach RS2+, RS3, RX, or RX2) with clear sky view
* Smartphone or tablet running Emlid Flow (iOS 14+ or Android 7+)
* Internet access on your phone (mobile data or Wi-Fi)
* Active RTKdata.com account with username and password

{% hint style="info" %}
Don't have an RTKdata.com account yet? 👉 [Start 30-day Free Trial](https://rtkdata.com/try-rtk-corrections-free-for-30-days/) or [View Pricing](https://rtkdata.com/pricing/)
{% endhint %}

## Step-by-step setup

{% stepper %}
{% step %}

#### Power on and connect the receiver

1. Turn on your Emlid receiver and wait for the LED to indicate it is ready (blinking blue on RS2+/RS3).
2. Open Emlid Flow on your phone.
3. The app will detect your receiver via Bluetooth or Wi-Fi. Tap on your device name to connect.
4. Wait for the receiver to acquire satellites. The status bar will display the number of satellites tracked.
   {% endstep %}

{% step %}

#### Open correction input settings

1. In the main Emlid Flow interface, tap the **Correction input** tab (satellite dish icon on the bottom bar).
2. Select **NTRIP** as the correction source.
   {% endstep %}

{% step %}

#### Create a new NTRIP profile

1. Tap the **+** button or **Add new** to create a new profile.
2. Give the profile a name (e.g., "RTKdata Europe").
   {% endstep %}

{% step %}

#### Enter RTKdata.com connection settings

Fill in the following fields:

* **Send receiver position (NMEA):** **ON**

{% tabs %}
{% tab title="North America" %}

* **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`
  {% endtab %}

{% tab title="Europe" %}

* **Host (domain):** `eu.rtkdata.com`
* **Host (IP fallback):** `3.73.41.96`
* **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`
  {% endtab %}

{% tab title="Australia" %}

* **Host (domain):** `aus.rtkdata.com`
* **Host (IP fallback):** `54.206.56.130`
* **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`
  {% endtab %}
  {% endtabs %}

{% hint style="warning" %}
**Global CS vs. Local CS:** When the app asks you to confirm the coordinate system during NTRIP setup, select **Global CS** (not a local coordinate system). The `AUTO` mountpoint handles regional corrections automatically. Apply your local datum or projection only in the survey project settings, never in the NTRIP connection configuration. Mixing this up is the most common source of coordinate errors with Emlid receivers.
{% endhint %}
{% endstep %}

{% step %}

#### Connect and wait for FIX

1. Tap **Apply** or **Save** to store the profile.
2. Tap the toggle or **Connect** button to start streaming corrections.
3. Watch the solution status in the top bar: **Single → Float → FIX**.
4. Once you see **FIX**, your receiver is operating at centimeter-level accuracy.

**How to verify RTK is working:**

* **Solution status** in the status bar displays **FIX** (green indicator).
* **Horizontal precision** shows values of **0.014 m** or similar (1–2 cm).
* **Correction age** remains below 5 seconds (visible in status details).
* **Correction input** tab shows data actively streaming (byte counter increasing).
  {% endstep %}
  {% endstepper %}

{% hint style="warning" %}
**LoRa Conflict Warning:** If you also use an Emlid base station with LoRa radio, you must disable LoRa correction input before enabling NTRIP. Running both simultaneously causes correction conflicts and unpredictable position jumps. Use one correction source at a time.
{% endhint %}

## Troubleshooting

| Problem                       | Cause                                   | Fix                                                                               |
| ----------------------------- | --------------------------------------- | --------------------------------------------------------------------------------- |
| "Confirm login" popup repeats | Wrong credentials or unreachable server | Verify username/password; check hostname spelling                                 |
| Connected but stuck on FLOAT  | GGA not sent or poor sky                | Ensure **Send receiver position (NMEA)** is ON; move to open sky                  |
| "Mountpoint not found"        | Mountpoint not uppercase                | Enter `AUTO` in ALL CAPS                                                          |
| Coordinate system conflict    | Local CS selected during NTRIP setup    | Choose **Global CS** for the NTRIP connection; apply local CS in project settings |
| Receiver not appearing in app | Bluetooth/Wi-Fi not active              | Toggle Bluetooth/Wi-Fi off and on; restart the receiver                           |
| Accuracy stays at meter level | Too few satellites                      | Wait 30–60 seconds; ensure unobstructed 360-degree sky view                       |

## Tips for Emlid Flow

* **Global CS for NTRIP, local CS for projects.** This distinction is critical and the most common mistake.
* **Keep firmware current.** Update via Emlid Flow for improved RTK convergence and multi-constellation support.
* **Built-in survey tools.** Emlid Flow includes point collection, stakeout, and CSV/DXF export without needing a separate GIS app.
* **Profile switching.** Create one NTRIP profile per region for quick switching between work areas.
* **Check correction latency.** If correction age exceeds 10 seconds, switch between Wi-Fi and mobile data.