I do want to mention that I am not sure how the compass works as it is mainly a keychain. I know there is a bubble inside the compass face and the directions move but not being compass knowledgeable, please bid for the cuteness of the keychain and not to rely on the compass as it is not a professional one and cant be used as such. With this being said, the whistle is in very accurate working order The compass may move but how reliable it is I am not sure of.