Hansbreen velocity along the center line (stakes 2 to 11) is measured with a Global Navigation Satellite Systems (GNSS) receiver and were manually recorded weekly for stakes 2 through 5, and monthly for stakes 6 through 11, dependent on weather conditions. Monitoring of the glacier is conducted by Institute of Geophysics Polish Academy of Science. The minimum observation times at those stakes is between 20 and 30 minutes. Total error, taking into account GNSS receiver, stake tilt, and human factor is estimated at 20 cm.