# TOPODRONE DJI Air 2S PPK: questions and answers

> Source: https://topodrone.com/knowledge/topodrone-air2s-ppk-kit/topodrone-dji-air-2s-ppk-questions-and-answers/
> Section: TOPODRONE Air2S PPK KIT
> Updated: 2026-10-02

**Question 1.** Why does the drone periodically stop in the air during an automatic route flight?
**Answer**: the front sensors of the vision positioning system of the TOPODRONE DJI Air 2S PPK can periodically be blinded by light. This is not a defect: it is caused by the dual front sensor system of the drone. If this happens, it is recommended to disable the vision positioning system. See details here.

**Question 2.** Why does the TOPODRONE DJI Air 2S PPK need a constant radio link through the remote controller to fly a waypoint route?
**Answer**: waypoint flight of the TOPODRONE DJI Air 2S PPK uses the so-called «virtual sticks» technology, where the app and the remote controller take full control of the drone. [See details here.](https://topodrone.com/knowledge/topodrone-air2s-ppk-kit/launching-a-drone-on-a-flight-mission/)

**Question 3.**  Why was no \*.ubx file created on the memory card after several flights? 
**Answer**: After initialization and normal indication of the TOPODRONE DJI Air 2S PPK receiver, the \*.ubx file is created automatically and recording to the memory card starts. There are no documented cases where the \*.ubx file was not created with correct indication of the TOPODRONE DJI Air 2S PPK receiver. Check the LED status before every flight. In the vast majority of cases, a missing \*.ubx file was caused by the TOPODRONE DJI Air 2S PPK receiver not having been initialized because of operator inattention.