The angle of variation varies with the Earth's magnetic field but angle of deviation varies with boat equipment or with bumps and battering of the boat or compass itself.
I-engile yeendidi yahluka kunye namasimi kamazibuthe omhlaba kodwa i-engele yoku phambuka ngezixhobo zesikhephe okanye nokungqubeka namalahle isikhephe okanye ikhampasi ngokwayo.