I am new in QGIS, and I can't quite figure out how grid and scale work. Should my
"Project CRS" and my
"Grid CRS" be the same or not?
I played around with settings and after some time and managed to get what I think is correct grid (based on some comparison on existing maps). But still, I'm not sure how to set it up on other maps I plan to make and Google isn't helping.
My problem is - my scale is now off. For example, I know that distance from Zagreb to Sisak is around 50km, and based on my map it says around 70/80. Some other examples are even more extreme. What is the problem? Why is my scale now working?
I georeferenced my image perfectly - it matches with the OpenStreetMap layer beneath perfectly - but my scale is still off. Projection is World Mercator.