Quoting Christoph Dietzschold (cd@hoerbe.net):
> I googled, trying to solve this question, but couldn't find anything useful.
> 
> Everytime I use vim on NetBSD and try to navigate through the file (insert 
> mode) with the cursor-keys there are placed the capital letters A;B;C;D in 
> the text.
> 
> A<cr> up
> B<cr> down
> C<cr> right
> D<cr> left

You're in insert mode.  It's inserting the termcap entries for those
keys.  Move in <command> mode.