Everything is in the title. Never been able to find exactly.
Air Sim map sizes are documented here: Enduring Confrontation | War Thunder Wiki.
The map of every EC location is divided into grid sectors of a fixed size:
- In EC missions with a map size of 64 x 64 km, the size of a map grid sector is 8,192 x 8,192 metres.
- In EC missions on location “Dover”, the size of a map grid sector is 12,288 x 12,288 metres.
- In EC missions on location “Denmark”, “Sinai”, “Afghanistan”, “Spain” and “Vietnam”, the size of a map grid sector is 16,384 x 16,384 metres.
I don’t think anyone knows how big AB/RB map scales are. There was this suggestion for adding GRB-like grid scales for Air: