before i had a Edge 520 with custom maps (openfietsmap). When zoomed out, there was still some level of detail visible.
With the Edge 530 however, as soon as i zoom out to about 2km level, basically all details vanish. Only some highways remain visible which is mostly useless. I played around a bit with the map settings but could not figure out a solution. I am using the preinstalled map for western europe (Germany)
PS: I am so far unimpressed by the map drawing speed. I had hoped for more speedup compared to 520.