Bundle gmap.html directly into the code to make dump1090 independant …

[bdejean]

…of any

external file.

[antirez]

Hello, in theory this is a good idea but in practice development becomes slower. For instance recently I translated the file to use open street map, and I could just modify it and hit reload in the browser to see the changes. But still having a self contained executable is great, especially in embedded devices where the program is often used. I'll think about it, thank you.