1. 
   Jackstaff
   is the staff at the bow of a ship.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   Jackstaff
   A jackstaff is a small vertical spar (pole) in the bow of a ship, on which a particular type of flag, known as a jack, is flown. It is from this that the term Union Jack derives . == References== ...
   Found op http://en.wikipedia.org/wiki/Jackstaff
   
   
3. 
   jackstaff
   1) Is the staff at the bow of a ship
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/jackstaff/1
   
   

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