Apparently it's a glitch or you can purchase for 400 gems..all I've found.

Make sure you have done all tasks prior to this one. Then move the compass around a little..... Spinning arrow means your close and straight arrow tells you where to go next....(and I have done this myself) don't forget to tap on the compass after you place it where it needs to go.

Let me know if I can help with anything else.

The compass stays on your island. You can't move it to any other islands. Just go to the island the way you would normally go.

It will only play with the ball when needing to be fed. Wait before you feed it and make sure they are close enough together.

Go to the isle of relics and clear the trees, rocks, grass, hedges until you get the monkey piece.

Place it at the end of the walkway.

Top picture is where it catches the wind placement

Put compass at world market "where buyers and sellers meet".

Put compass at the world market

Compass placement

It will show a blue arrow, the spinning arrow means placement is close but wrong. It will send you to Windy Mill Islet