In 2005, the Chuch is studying the Doctrine & Covenants during Sunday School and many times there are places mentioned that are not known to members in general. It is helpful to use maps and descriptions to show where you are talking about. A good link for the actual trek is: https://www.mormontrail.net/
I will have to use this map more frequently. While I know the general geography and route of the trail, there are a lot of particulars that I don't know.
It is nice that it shows both the town I was born in (Evanston) and the valley where my grandfather and my dad grew up (Fort Bridger). Fort Bridger was a rather important part of the history of the Mormons in that region.
Actually, I have the pamphlet version of this... I was pondering scanning it as it has more detail than the online version and also gives some history behind it, but then when I saw the link above I realized it would just be a needless task.