# Unexpected Flight Behavior after new RTK GPS Installation

Source: https://forum.modalai.com/topic/3203/unexpected-flight-behavior-after-new-rtk-gps-installation
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2024-03-11 19:11:46 UTC by SMRazaRizvi
Replies: 2 · Views: 705

## SMRazaRizvi · 2024-03-11 19:11:46 UTC

Hello All,

I'm experiencing some unexpected Flight behaviors after the installation of a new RTK GPS onto my Sentinel Drone.

For example, the drone takes off fine, but if I try to move it toward right, it rolls back to the initial position. Similar happens in all the directions.
Secondly, I am frequently getting `Manual Control Lost` messages on the QGC, and then it recovers from it.

Can anyone please guide me?

Here's the PX4 flight log:

https://review.px4.io/plot_app?log=548193c7-7dad-4e84-a79b-e4791455a936

## Reply by Alex Kushleyev (ModalAI staff) · 2024-03-12 05:40:05 UTC

@SMRazaRizvi , looks like this is the wrong log.. only 5 seconds long. 

Did you test the vehicle with the original GPS (non RTK)

## Reply by SMRazaRizvi · 2024-03-12 14:11:34 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev No. This was a test for the RTK GPS. I'll try.