ENGR. EFE TANA (B.SC, MSC), a United States of America based specialist in Global Navigation Satellite Systems with special interest in the “Galileo”. With over 40years experience in Geophysical Surveying and positioning on land, swap, shallow marine, Offshore and Desert Seimic operations mainly in the Oil and Gas Industries spanning over West and East Africa, Middle East and Central Asia. He is happily married with Children.