ArUco Markers and GPS

Hello,
Is possible to use both ArUco Markers and a gps module to , or to put ArUco Markers as a failsafe in case gps fails?

Yes, it is possible. But you will need to write a lot of code for a companion computer.

Hi, thanks for the answer,I am planning in using the markers only to help with the landing, the rest of the flight would be all gps, would still be difficult?

We do that already for over two years. You can read about in my paper here:
https://www.ksp.kit.edu/index.php?link=title_info&oldTitleID=1000124383

yes, it is complicated.