# Using another external Visual System for Localization

Source: https://forum.modalai.com/topic/158/using-another-external-visual-system-for-localization
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Tags: voxl-vision-px4, voxl
Posted: 2021-03-16 15:41:53 UTC by vmassague
Replies: 1 · Views: 1488

## vmassague · 2021-03-16 15:41:53 UTC

Hello, 

I have a VOXL m500 and I was trying to use an external visual system (i.e. mocap) for localization running with MAVROS. 

**Problem**

In MAVROS, I can see the raw data of the sensor, but PX4 seems to not receive the data from it, (local_position_NED is 0). 

**Steps to reproduce**

1. I disabled VIO by setting `en_vio` to false in the file `/etc/modalai/voxl-vision-px4.conf`. 
2. Spin up a node for the external visual system that publishes to `vision/pose_cov`
3. Run MAVROS
4. `rostopic echo vision/pose_cov` gets the correct data from the localization sensor
5. In QGroundControl `local_position_ned` is 0, not getting any data from the external visual localization system

**Expected Behavior**

QGroundControl is receiving the data from the external visual localization system.

Do you know how can I successfully integrate a visual system for localization in the VOXL? 
Thank you in advance

## Reply by DarkKnightCH · 2022-07-01 15:36:58 UTC

@vmassague Hi, I am pretty much doing the same thing and I faced a similar issue with you. 
have you solved this issue? 
https://forum.modalai.com/topic/919/using-motion-capture-systems-optitrack-for-position-estimation/2?_=1656684369036