| Low-Cost Visual Tracking of a Landing Place and Hovering Flight Control with a Microcontroller Recent countries visiting this post |  |
 | 8 | United States |
 | 4 | |
 | 3 | Russian Federation |
| Low-Cost Visual Tracking of a Landing Place and Hovering Flight Control with a Microcontroller Recent countries visiting this post | |
| 8 | United States |
| 4 | |
| 3 | Russian Federation |