hey cyril, thanks a lot for the links, you are really a saviour! btw let me tell me u, i gave the last online navigation general paper(jan 2012), and i had thouroghly studied keith williama all the 4 books, but hardly anything came from these books! i guess dgca has realized that almost everyone is studying keith williams, hence they have stopped asking from there! and to my knowledge they neither asked anything from oxfrod or gsp! but anyways i stiil not goinf to lose hope, will try harder this time!