# Trimble Mobile Manager

{% hint style="success" %}
Before capturing Field Points:

* Trimble Mobile Manager must be running in the background.
* Your DA2 must be [connected](https://help.trimblegeospatial.com/Catalyst/DA2-connection.htm) via Bluetooth.
* For RTK corrections, you must have an active [RTK session](https://help.trimblegeospatial.com/TMM/Catalyst-screen.htm).
  {% endhint %}

***

## Motivation

I want to capture Trimble DA2 coordinates for [FIeld Points](/home/fieldagent-mobile-ios/60-second-guides/ground-control-points.md).

***

## Requirements

* Make sure that your DA2 is powered on and [connected](https://help.trimblegeospatial.com/Catalyst/DA2-connection.htm) via Bluetooth.
* If you still need to set up your DA2 and TMM app, please refer to the [Trimble Documentation](https://help.trimblegeospatial.com/TMM/Installation.htm) for details.
* You will likely want to select `WGS84(G1762)` for the GNSS Output Frame.

{% hint style="info" %}
Verifying the selected reference frame and ensuring that it meets the project requirements is a critical practice. 

See the [Trimble Documentation](https://help.trimblegeospatial.com/TMM/Configure-GNSS-output.htm) for information on changing the reference frame.
{% endhint %}

***

## Steps

Open the Trimble Mobile Manager, then:

1. Tap on the Home tab.
2. Tap on the Select button.
3. Tap on your Trimble DA2 in the left menu.
4. Tap the Connect button.
5. Background the app.

{% hint style="success" %}
With TMM running in the background and your DA2 connected via Bluetooth, FieldAgent mobile can read the RTK-corrected position data.
{% endhint %}

You can start an [RTK session](https://help.trimblegeospatial.com/TMM/Catalyst-screen.htm) anytime.

<figure><img src="/files/vrYWtvWCH7RWXTWHJI3v" alt=""><figcaption><p>Connecting your DA2 in TMM</p></figcaption></figure>


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