# A question about VOXL_VISION_PX4

Source: https://forum.modalai.com/topic/45/a-question-about-voxl_vision_px4
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2020-11-22 13:29:59 UTC by Vũ Văn Long
Replies: 1 · Views: 1697

## Vũ Văn Long · 2020-11-22 13:29:59 UTC

hello development, i am a user of VOXL_m500 product and i'm trying to setup a  first flight with deinided-GPS navigation feature. by default px4 will detect the location of UAV base on GPS, so in the case of m500 uav the operation environment will be indoor space. i know that it use odometry data frome the optical sensor to check uav location in space. i have a question that is how the px4 is accepted odometry data (or please give me some source code, i just want to ensure that the uav used odometry data instead the location from GPS. thank you so much !

## Reply by Chad Sweet (ModalAI staff) · 2020-11-22 16:06:52 UTC

Hello! Always good to be safe. Have you read the documentation [here](https://docs.modalai.com/flying-with-vio/). I believe this is what you are looking for