# Multi Vehical position mismatch

**URL:** <https://discuss.px4.io/t/multi-vehical-position-mismatch/33558>\
**Category:** PX4 Autopilot\
**Created:** [July 30, 2023, 1:37pm UTC](https://discuss.px4.io/t/multi-vehical-position-mismatch/33558 "2023-07-30T13:37:16Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![hmer101](https://discuss.px4.io/user_avatar/discuss.px4.io/hmer101/32/12620_2.png) [@hmer101](https://discuss.px4.io/u/hmer101)\
**Post date:** [July 31, 2023, 9:10pm UTC](https://discuss.px4.io/t/multi-vehical-position-mismatch/33558/2 "2023-07-31T21:10:09Z")

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What do your model and world .sdf files look like?

Can the issue you’re talking about be solved by adding a reference link at the start of the model (mentioned in my last post [here](https://discuss.px4.io/t/simulating-multiple-physically-connected-drones-in-gazebo/31153/9))? The positions seem to be taken relative to the first link in the world and thus if your first link is a drone, the reference position will move, giving strange results.

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_[View the full topic](https://discuss.px4.io/t/multi-vehical-position-mismatch/33558)._