When one would rank the geo-data collection techniques developed the last three decades or so from most significant to least significant, positioning and navigation by means of Global Navigation Satellite Systems (GNSS) would head the list. GNSS enables obtaining precise positioning and timing information anywhere on land, on sea or in the air, day or night with high precision and reliability and against affordable costs. GNSS does not require cleared lines of sight between survey stations as other conventional surveying procedures, which rely on observing angles and distances between visible ground stations, required for determining two-dimensional or three-dimensional coordinates of points.