# Set Fixed LLH or ECEF

**This step-by-step tutorial will let you to manually set the Longitude, Latitude, Height and Earth-Centered Earth-Fixed for the Base.**

> **LLH**: Longitude, Latitude, Height
>
> **ECEF**: Earth-Centered Earth-Fixed

First, connect your GNSS device to a computer using a USB micro cable.

![](https://3825805345-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LYSZeu4HjB-NrVI4riL%2F-LdEnSI1uNcnTmxfEH77%2F-LdEnYZLwhXVFEwUuCNY%2Fassets_-LYSZeu4HjB-NrVI4riL_-LZ5e77FV8hJoLVGS7xa_-LZ5eg7yAUc-02Xt3jdx_USB_connect-\(1\).png?alt=media\&token=9818d259-dd93-4562-ace6-7d07e705f9f9)

Now start the U-blox “u-center” software. Then on the top left corner of the screen, left-click on the reversed tiny black triangle to select the COM Port related to your GNSS device. (the COM port may differ, COM7 as shown in pictures)

![](https://3825805345-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LYSZeu4HjB-NrVI4riL%2F-LYbICDde_PqBQRMcCsl%2F-LYbIddBqnC-aXKJ1bxh%2FSans-titre-1.png?alt=media\&token=240244db-09d5-40e8-9735-869651b9198e)

Make sure the connection icon is blinking in the bottom state bar. It indicates that the serial communication between the computer and the GNSS device is working.

![](https://3825805345-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LYSZeu4HjB-NrVI4riL%2F-LYbGvHfj8nIN6gywxBz%2F-LYbHSKTiJZ0j0qAf-5e%2Ficon_blink.png?alt=media\&token=0f35cbc4-ce5a-4d3b-90f4-ecadc5a36821)

Next go to ‘View’ then click on “**Generation 9 Configuration View**”

![](https://3825805345-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LYSZeu4HjB-NrVI4riL%2F-LYbTIvEVGMGLVnSeoFn%2F-LYbUsIAWEUg8JmCOVN6%2Fstep3.png?alt=media\&token=bd43162b-1a87-42b7-b165-c0ce0504ebe4)

A new window showing by default “**GNSS Configuration**” opens.

1. So first, click on “**Advanced Configuration**” to display all the configuration registers.
2. Then click on the small ‘+’ on the **CFG-TPMODE** line
3. You can now have access to an expanded menu and click on **CFG-TPMODE-MODE**
4. Select “**2-FIXED**” in the dropdown menu
5. Click consecutively on **RAM**, **BBR** and **Flash** to write changes into RAM and both non-volatile memories (BBR and Flash)
6. Check the 3 corresponding commands are present in the “Ready to send” box and then click on ‘**Send**’

![](https://3825805345-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LYSZeu4HjB-NrVI4riL%2F-LYbimrKIWPaw61FLjgh%2F-LYbizDK-0RpErknp_eD%2Fstep4%20change_FixedMode.png?alt=media\&token=90926dcb-78fa-40be-a4fd-f357d5ed5a4b)

{% tabs %}
{% tab title="LLH: Longitude, Latitude, Height set up" %}

> Make sure to set up the base in Fixed Mode before setting up LLH mode

A new window showing by default “**GNSS Configuration**” opens.

1. So first, click on “**Advanced Configuration**” to display all the configuration registers.
2. Then click on the small ‘+’ on the **CFG-TPMODE** line
3. You can now have access to an expanded menu and click on **CFG-TPMODE-POS\_TYPE**
4. Select “**1-LLH**” in the dropdown menu
5. Click consecutively on **RAM**, **BBR** and **Flash** to write changes into RAM and both non-volatile memories (BBR and Flash)
6. Check the 3 corresponding commands are present in the “Ready to send” box and then click on ‘**Send**’

![](https://3825805345-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LYSZeu4HjB-NrVI4riL%2F-LYbimrKIWPaw61FLjgh%2F-LYbjU4df099o-IsB71I%2Fstep4%20change_LLH.png?alt=media\&token=bbfcf7c5-a884-4fe7-b9ed-23edac3d6c46)

#### Setting up the Longitude and Latitude

A new window showing by default “GNSS Configuration” opens.

1. So first, click on “**Advanced Configuration**” to display all the configuration registers.
2. Then click on the small ‘+’ on the **CFG-TPMODE** line
3. You can now have access to an expanded menu and click on **CFG-TPMODE-LAT**
4. Enter a valid degree value within a 1e-7 scale (ex : you want 45.9635687° = you write 459635687, if you want 01.9532443° = you write 019532443)
5. Click consecutively on **RAM**, **BBR** and **Flash** to write changes into RAM and both non-volatile memories (BBR and Flash)
6. Check the 3 corresponding commands are present in the “Ready to send” box and then click on ‘**Send**’

![](https://3825805345-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LYSZeu4HjB-NrVI4riL%2F-LYf0JXPn7bjWAR3UfIT%2F-LYf1G7gwgnOalF84iqd%2Fstep4%20change_LAT%26LON.png?alt=media\&token=7a92b3ec-d906-497d-8849-220f94f7cb8a)

> Repeat the same process to set CFG-TPMODE-LON value 
>
> Make sure to set up the base in Fixed & LLH mode before setting up LAT & LON

#### Setting up the Height

A new window showing by default “**GNSS Configuration**” opens.

1. So first, click on “**Advanced Configuration**” to display all the configuration registers.
2. Then click on the small ‘+’ on the **CFG-TPMODE** line
3. You can now have access to an expanded menu and click on **CFG-TPMODE-HEIGHT**
4. Enter a valid height value in cm (ex : you want 200m = you write 20’000)
5. Click consecutively on **RAM**, **BBR** and **Flash** to write changes into RAM and both non-volatile memories (BBR and Flash)
6. Check the 3 corresponding commands are present in the “Ready to send” box and then click on ‘**Send**’

![](https://3825805345-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LYSZeu4HjB-NrVI4riL%2F-LYf20m0OfzkTNOSMn7g%2F-LYf2FoeuHSgNGEi-695%2Fstep4%20change_HEIGHT.png?alt=media\&token=fc2aea63-9557-4b39-8acc-bef3d7dd71bf)

> Make sure to set up the base in Fixed & LLH mode before setting up HEIGHT

{% hint style="success" %}
You have successfully configured your GNSS device and can start using it !
{% endhint %}
{% endtab %}

{% tab title="ECEF: Earth-Centered Earth-Fixed set up" %}

> Make sure to set up the base in Fixed Mode before setting up ECEF mode

A new window showing by default “**GNSS Configuration**” opens.

1. So first, click on “**Advanced Configuration**” to display all the configuration registers.
2. Then click on the small ‘+’ on the **CFG-TPMODE** line
3. You can now have access to an expanded menu and click on **CFG-TPMODE-POS\_TYPE**
4. Select “**0-ECEF**” in the dropdown menu
5. Click consecutively on **RAM**, **BBR** and **Flash** to write changes into RAM and both non-volatile memories (BBR and Flash)
6. Check the 3 corresponding commands are present in the “Ready to send” box and then click on ‘**Send**’

![](https://3825805345-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LYSZeu4HjB-NrVI4riL%2F-LYf2U5tjNQGHKwTSmUU%2F-LYf2lhrGdGsfoKjs_yr%2Fstep4%20change_ECEF.png?alt=media\&token=75300a7d-7ef4-4870-a91f-7d90f106af42)

{% hint style="success" %}
You have successfully configured your GNSS device and can start using it !
{% endhint %}
{% endtab %}
{% endtabs %}