-A high-quality folding knife with a fid built in (Myerchin makes a nice one)
-Good flashlight, LED preferrably (Streamlight is a good make)
-a hand-held depth-finder $100 at West
Marine. Great for finding suitable passes in shallow
water, sorting out an anchorage to see if you can swing without hitting, helping others to tie up at shallow docks, etc...all scenarios a cruiser will see eventually.
-an electronic barometer/ weather station.
Oregon Scientific does a nice one...
My vote, go for the knife. Can never have too many on board.
John