Mini-map Radius?

Is it me or does the mini-map function have some sort of invisible radius? It shows only some hidden relics based on where I am, rather than revealing every single thing on the map. Seems to be equal to Arat Berry's radius?

There is a vision boundary for sure, as evidenced by the fact that you can only see monsters for a short range. This may be directly related to your vision or rendering, or the maximum setting on either. I personally don't care enough to play with it.

Ah, I forgot the other markers existed.