Can Precis-BX306 work well for aerial photogrammetry with UAV without the need for ground control points (GCPs) ? Yes, the following solution can be used to replace the GCPs: You can setup a base with our Precis-BX306 , and then transmit RTK corrections from the base. After the corrections are received, it will output accurate (cm-level) positioning and heading info. In the application of aerial photogrammetry with UAV, after the camera take a picture, it will send a pulse from the PC (Prontor-Compur connection) port to the receiver, the accurate position (cm-level) will be saved. The photos and their positions will be input to the mapping software (eg, PIX4D or Agsoft) to get an accurate map. Do I need a specific camera to work or any camera? No specific camera is needed; you can use any camera which has a PC (Prontor-Compur connection) port. And the synchronization between the shutters to the flash must be enabled. When the camera is taking a photo