For my major, it is essential that you can read a map (and a variety of maps at that [and you are expected to be able to, in some cases, construct a map yourself]). I don't find it to be extremely difficult, though, it can get a tad confusing when you're just starting out. For example, when you transition from contour lines on land to bathymetric lines in water. They are very similar in essence, though they do vary to a degree.