GLATIS is an extensive teleseismic experiment designed to uncover the seismic velocity structure of the Greenland shield and upper mantle from 60 deg. N to 77 deg. N. The study area is important for the understanding of the break-up and opening of the N. Atlantic approximately 61 Myr ago, and the role of the Iceland plume prior to the break-up. In project GLATIS a pilot study during summer 1999 obtained excellent quality BB seismological data from the NGRIP ice location, recording more than 40 teleseismic events of magnitude less than 6 in 3 weeks. Seismic energy is apparent up to a period of approx. 60 s, which is satisfactory given the distance and magnitude of the events. More data will be collected on the coasts during the period fall 2004 to fall 2005.