Kalmar "Magnetic Magnetic Pole" tana nufin sandar maganadisu da ke nuni zuwa kudu lokacin da aka dakatar da maganadisu cikin 'yanci ko kuma a ba da izinin juyawa. Ita ce sandar da aka ja hankalinta zuwa ga igiyar arewa na wani maganadisu kuma wani igiyar kudu ta tunkude shi. Ana kiran wannan ma'aunin maganadisu mara kyau saboda yana da kishiyar polarity na maganadisu na duniyar maganadisu ta arewa, wanda shine ainihin sandar kudanci mai maganadisu.