Tips 1 : f| will help you locate the character area immediately.

Tips 2 : :Hexsearch 41414141 can help you search for a hex string, then n can help you find the next matching string in order.
:HexsearchClean help you clean up your last "Hexsearch" and restore VIM's default matching function.

    $ git clone https://github.com/rootkiter/vim-hexedit.git ~/.vim

    $ git clone https://github.com/rootkiter/vim-hexedit.git ~/.vim/bundle/vim-hexedit