PRO: Projection information record where TME indicates Transverse Mercator and the central meridian of -87 indicates UTM, zone 16.ĭEV 0: Indicates that the lines with device designation 0 are lines of DGPS data collected with the Ashtech system. The name of the ellipsoid followed by the semi-major axis in meters and the flattening ratio.
More files could be affected.ĮLL: Ellipsoid information. This affects files in the MadSwan folder (001*.DAT through 006_0422.DAT). ***In this case, the information recorded in at least some of the files was from another survey. The three numbers at the end refer to initial tide correction at start-of-line, initial draft correction at start-of-line and sound velocity. This typically contains the survey participants, the vessel name, other agencies involved with the survey, and the location of the survey. INF: General survey information filled in by the data technician.
Keywords and the information they provide are as follows:įTP: The first record located at the top of the header used to identify the file format. The times recorded in the navigation file are in UTC. HYPACK (unknown version) was used to record navigation.
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