The application relates to a fitness monitoring device with an altimeter. The invention describes a biology metering monitoring device and includes various technologies which can be applied in the device. Besides, the technology for being employed by the altimeter in the biology metering monitoring device is provided. In some embodiments, the technologies are provided: re-calibrating the biology metering monitoring device based on position data; employing data of the altimeter as the aid of posture recognition; and/or employing the data of the altimeter to manage an airplane mode of the biology metering monitoring device.