I really like simple base plate compasses and find them surprisingly accurate. I have taught navigation classes and students learn quickly even with the simplest, inexpensive base plate compasses. I have never used a mirror compass and was wondering if they are truly more accurate and if they are easy to use. For example, the mirror reads the numbers on the bezel in a mirror image; so are they difficult to read? Some of them have a little peep hole at the bottom of the mirror. Does that make it easier to sight on a landmark or objective?

UST has some reasonably priced mirror compasses that are reported to be rugged and well made. http://www.ustbrands.com/product/hi-vis-folding-map-compass/
2.5 ounces. Is the mirror worth the extra weight?