Hello,
There are two plugins that will show the track changes in PDF and on screen.
http://www.ctrlpublishing.com/products/ctrlchanges
and
http://www.kerntiff.co.uk/products-4-indesign/editmarks
There is a free script to navigate the track changes.
http://www.kerntiff.co.uk/products-4-indesign/editmarks/editmarks-navi gator
All the best.
P.