heeling error - The error in a compass reading caused by the heel of a boat.
hemisphere - Half of a sphere. On the globe hemispheres are used to describe the halves of the earth north or south of the equator.
heeling error - The deviation of a compass reading which is created by the shift of heavy iron (engine/keel) within the vessel such that the magnetic force varies.
Heeling Error:
The error in a compass reading caused by the heel of a boat.
Helm:
The apparatus by which a vessel is steered, including the rudder, steering wheel and tiller.
 See also: Hitch, Lines, Heads, Downwind, Forward
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