On Mpas found in School classrooms:
Real distance between Svetlojarsk and Skaltsky island is around **10km**
Using the scale on this map to measure it gives you the wrong scale of 17km
In Fact the scale that shows 20mi is corresponding to real 20km
http://images.akamai.steamusercontent.com/ugc/491277725855980679/65102643E31F1DFB6B9D1489CCE5BC15FFF265D6/