You should always lock the ipd in vr settings to your ipd for all aircraft. it will make car, trees, everything in scale to you! If you dont know your IPD you can download an IPD ruler here and have someone hold it to your pupils and give you a reading. https://www.targetoptical.com/wcsstore/TargetOpticalStorefrontAssetStore/Attachment/TO-PD%20Ruler-FINAL-062113.pdf