Federal Pioneer making a short stop to bunker. She is Scheduled to sail at 1700.
Bunkering is the process of refueling a ship, whereby a taker (in Halifax, The Algoma Dartmouth) or a barge comes along side and transfers Fuel.

For more insight on the life of a bunkerer, read HAWSEPIPER: The Longest Climb written by Paul, who is a Mate on a Buker Barge.