GNSS Survey & Engineering aims at providing the everyday professional GPS user with enough background for the understanding and correct operation of satellite navigation equipment in general and GPS in particular. Today, GPS is almost synonymous with simple navigation and positioning in nearly all sectors. There are many brands and models to choose from and prices are low. Even so, thorough knowledge of satellite navigation seems to be private to specialists like geodesists and manufacturers. The group of daily users of GPS systems and data however is becoming larger by the day.