What does rotating the compass do?

I've unlocked field E3, it has a little compass on it, if I click on the compass, I can change the direction it's pointing at, after rotating it a full circle I got an achievement. Bombing it didn't seem to do anything at all.
What use does this compass have? I'm assuming it has some effect in the game, especially since it also shown on the world map that the level has a compass. What do I have to do to get it to do something?
Best Answer
Yes, the compasses do something.
When you set the compasses correctly
the reward is
five fields, when beaten, will each yield 1 talisman fragment of set rarity
after that, the compasses have no effect.
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How do you use a spinning compass?
These markings are used to get bearings (the direction from where you are, to where you want to go). If you rotate the ring to line-up the red north of the needle to the red arrow on the baseplate, a bearing can be be taken from the compass ring.What is the rotating ring in the compass?
A compass is a navigational instrument for determining direction relative to the Earth's magnetic poles. It consists of a magnetized pointer (usually marked on the North end) free to align itself with Earth's magnetic field. The compass greatly improved the safety and efficiency of travel, especially ocean travel.Why is compass direction important?
The most important part on the compass is the magnetic needle. It swings around the compass as you move, but the red end will always point in the direction of north and the white (or sometimes black) end will always point in the direction of south.How to use a Compass Bezel - Watch and Learn #17
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Answer 2
There are 7 compasses in the game. Each must be set to a specific direction (random by game, so yours will be different from mine.)
On the load screen you will see 7 gems... if they are level 5 gems they are correct, otherwise they are wrong. Each gem corresponds to a different compass.
It's worth mentioning you do NOT have to beat (or even play) the level to change the compass setting, merely load the level, change the compass and then reload the level to see if you got it correct.
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