EPSG code is a unique identifier for different coordinate systems. It's a public registry of geodetic datums, spatial reference systems, Earth ellipsoids, coordinate transformations and related units of measurement. Each entity is assigned an EPSG code between 1024-32767.
EPSG code is very important for us to find the correct location of your coordinates on earth. There are so many different coordinate systems defined for different areas. If you provide it wrong, the coordinates will be mapped to a completely different location.
To find your EPSG code correctly, the most accurate way is to check the coordinate system information on your GPS device, sometimes it won't show the EPSG code directly. If in this case, you can provide the information to us, we will help you figure out the correct EPSG code.
If you have no idea of the coordinate system in the GPS device, the only thing you have is some coordinates and images taken by drone, you can also contact us. We'll search in our database to find the best matching EPSG code. However, this approach won't guarantee to be accurate, it will find the possible one, but will it be the correct one? We don't know. So it is still recommended to try the approach one first.