Behind, toward the stern. Abaft the beam is the area between abeam and astern. Compare with aft.
To leave a fatally distressed vessel. An abandon ship bag (grab bag) is a container of emergency and survival gear pre-prepared by the crew to take with them if they must abandon ship, usually containing tools, water, VHF radio, flares, food etc.
At right angles to the boat
Towards or at the back of the boat.
The wind that blows over the boat modified by the boat's forward progress. The wind direction felt on the boat as it moves, a combination of the true wind blowing over the land, and the wind created by the boat's movement relative to the land.
Behind the boat
A downwind sail, flown from the bow of a boat, often from a short bowsprit. Sometimes called A-sail and, incorrectly, gennaker. Asymmetric spinnakers can only be flown one way round, i.e. with one dedicated corner, the tack, attached to the spinnaker pole or the bowsprit, one dedicated corner, the head, attached to the halyard, one dedicated corner, the clew, attached to a sheet.
Across the beam of the boat