The reason for this is that the skin has undergone a messy modification and has been crippled on purpose. Displaying the data details and other settings have been set and saved here. Then whoever modified this skin, removed the control of these settings that would normally be available in the original "decent" skin .
So you need to copy over or replace all the files provided. The font folder will definitely be needed for the data on the info bar.
Remember that all i have done is resized it to run on 800_480 I haven't changed any of the functional code. all of this monkey business is courtesy of the person who originally modified this skin .
In my opinion the code in this skin has been left in a right mess. as jtrosky has said, you would be better off using a real "Desent" skin and add the missing functions.
As far as I know the info bar and linear compass only becomes visible in the main navigation screen once the gps has a fix.