Procedure from SBF to GPS_Corrected_RDNAP.txt: 1. Raw sbf data from the receiver is converted to Rinex Format using SBF2RINEX. 2. Rinex files are corrected using Rinex correction files from Hoek van Holland provided by LnR Globalcom. - For the correction Leico Geo Office suite is used. - All values not having a full phase fix are discarded. - The output is called GPS_Corrected.txt and is in Cartesian coordinates. 3. GPS_Corrected.txt is converted to RDNAP coordinates using Coordinate Calculator provided by Rijkswaterstaat. - The output is called GPS_Corrected_NAP.txt Intermediate files are stored in cache folder. Jetski -- hypack RTK