Some things don't change because they don't have to, like these brass compasses. The compass on the left is from Tru Nord and made in Brainerd, Minnesota. The other is made by Marbles. These compasses use no batteries and do not not synchronize with a satellite. They are waterproof and shockproof. Both of these act as a third layer of safety behind your main compass and (if you have one) your GPS.
There are many, many books and videos on reading maps. The Boy Scout book is about 60 pages and covers everything.
Do you know which way is uphill on the map?
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