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Connecting to Reach

This guide explains how to connect to your Reach RS4 / RS4 Pro using the Emlid Flow app.

Overview​

Emlid Flow allows you to control your Reach RS4 / RS4 Pro receivers with iOS or Android devices. Using the app, you can access your receiver over a Wi-Fi network, set it up for the survey, and collect and stake out points. The connection process is similar for both iOS and Android devices.

Download Emlid Flow​

To manage Reach RS4 / RS4 Pro, download the Emlid Flow app on your iOS or Android mobile device.

Download Emlid Flow


Using Reach with Android devices

Some Android devices have battery optimization enabled by default. Make sure you disable it for Emlid Flow to avoid disconnection.

Power up Reach​

tip

You can read more about power supply in the Power supply guide.

To power up your Reach, follow the steps below:

  1. Hold the Power button for 5 seconds to turn the unit on.

    caution

    Do not hold the power button for longer than 5 seconds, as this will switch the receiver to Factory mode, which is used by the Support team for troubleshooting. In this mode, the receiver only responds to a long press of the Power button.

    To exit Factory mode, do as follows:

    1. Press and hold the Power button.

    2. Wait until the outer Battery LEDs on the left and right sides turn solid blue.

    3. Release the button and allow the receiver to boot normally.

  2. Wait until the Battery LEDs stop blinking and the Network LED stays solid white.

Now you can connect to your Reach.

Connect to Reach​

You can connect to your Reach in two ways:

  • Using the BLE connection option. This is the recommended connection method. It is especially useful when working with corrections from an NTRIP provider. In this setup, the receiver uses your mobile device’s internet connection, so you only need to select the NTRIP over BLE option when configuring the receiver’s correction input.

    tip

    Learn more about working with corrections from an NTRIP provider in the How to set up RTK over NTRIP service guide.

  • Using the Wi-Fi connection option. In this case, your device and Reach must be in the same Wi-Fi network.

To connect to your Reach receiver using Bluetooth, follow these steps:

Connecting to Reach via Bluetooth​

note

Make sure your Reach receiver is running firmware version 32.2 or later, and that the Emlid Flow app is updated to version 12.2 or newer on both iOS and Android devices.

  1. Enable Bluetooth on your smartphone or tablet.

  2. Open Emlid Flow. When prompted, tap Configure access and allow both location permissions and precise location. This is required for full receiver functionality.

    note

    Reach prioritizes the current connection when using BLE, regardless of type:

    • If Reach is connected via Bluetooth Classic to third-party software, disconnect it before using BLE in Emlid Flow.
    • If another device is connected to Reach, disconnect it before reconnecting using BLE in Emlid Flow.

    After granting permissions, your receiver will appear in the list. The app will connect to it automatically.

    If you have multiple Reach receivers, tap the one you want to connect to and wait for the connection to complete.

  3. Once connected, check for firmware updates. If an update is available, a red dot will show next to the Settings section. Update the receiver firmware.

    note

    This step is optional, but we recommend updating your receiver regularly to ensure full functionality and access to the latest features. For more details, check out the How to update firmware guide.

Video guide​

Check out the workflow in the video below:

Further reading​