Compass
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The compass`s values
The compass shows the way (magnetic) north. As an added bonus because you know where north is you can also find east,south,and west. The reason you can do all these cray awesome things is that the magic is in the needle that points north because it`s made of special metal.
For sale now at your local bartering station!
Chistopher Columbus approved!
Christopher Columbus sailed the ocean blue in 1492 but without the compass America, Canada, and Mexico may have not been discovered unti`ll a much later time causing a lot of issues (not for the native americans though). The compass lead Columbus right to us, and If he hadnt gotten a little lost (he must have lost his compass.) then I might not even be here right now talking you guys into buying compass`s (that would be truly terrible for you guys considering what a great investment they are.)