arrows direction and maps

[zhjygit]

I have used the makerfabs to finish this project, everything is fine. I used the mpu9250 module to receive compass data. However, i found that the arrow on the maps cannot move, meanwhile, the maps move according to the compass data. In common sense, like maps on the phone, the arrow direction changes with the owner walking direction, and the maps always remain unchangeable. So, how can i hold the maps direction and change the arrow direction according to the compass?