Map Legend changes when scrolling map vertically

Question

With the map scrolled all the way out, when you move it vertically it, the legend changes
With map in middle. 5000km:5000miles
with map lying on bottom of screen 5000km:2000miles
with half of map scrolled out of the screen 200km:100miles
with map out of screen 10km:5 miles

Answer 1

Yes. Old Mercator will mess you up everytime.
On the maps that only cover a small area, the scale makes sense, but on the map of the whole world, the scale is non-linear and not the same in all directions, so you can't use it for much.
Hal