A plan-position indicator in which the true north on the display remains fixed in spite of the movement of the ship.
Note: The term is extended to stabilisation with respect to magnetic north.
Reference: B.S. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Centre of buoyancy
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM