Joycef,
I've merged your threads together, please use this thread for the game.

The WT says this, Scroll the chart by left click-hold and move the mouse.
Use Davy's decoded cipher as longitude (vertical) - 5.6436 and latitude (horizontal) - 6.134.
Click at the point of intersection. Use the shape of the islands in the picture below as reference.
The point of intersection is at the coast of Ardnamurcham.