Kusurwar dip, wanda kuma aka sani da kusurwar karkata ko kuma kusurwar maganadisu, tana nufin kusurwar da ke tsakanin jirgin sama da ke kwance da kuma alkiblar filin maganadisu na duniya a wani wuri. Ita ce kusurwar da allurar compass ke yi tare da kwance lokacin da aka riƙe matakin kuma ba za ta iya jujjuyawa ba. Kwanakin tsomawa ya bambanta a wurare daban-daban a saman duniya kuma yana iya kewayawa daga digiri 0 a ma'aunin maganadisu zuwa digiri 90 a igiyoyin maganadisu.