A winter sports tracking system, in various embodiments, is configured to measure winter sports athlete speed, heading, distance traveled, acceleration, and other motion related measurements based at least in part on magnetic field measurements taken by one or more magnetometers. In a particular embodiment, the system comprises one or more magnetometers (e.g., that may be embedded in one or more wearable devices, such as eyewear) and at least one magnet disposed on a portion of the winter sports athlete or their equipment. The system is configured to receive magnetic field information associated with the at least one magnet using the one or more magnetometers and determine the speed and other data based at least in part on the magnetic field information. In various embodiments, the system is configured to track movement and speed of a skier or snowboarder.