This is the assumption being made based on the information provided. OFF 2: device offsets for device 2 - see description above.ĭEV 3: Indicates that the lines with device designation 3 are related to navigation values for the towfish taking into account the range to fish. OFF 1: device offsets for device 1 - see description above.ĭEV 2: Indicates that the lines with device designation 2 are lines of depth collected by the Furuno echosounder. No offset for device 0 during this data collection.ĭEV 1: Indicates that the lines with device designation 1 are lines of range to fish. Format of the value is OFF dn n1 n2 n3 n4 n5 n6 n7 where dn=device number n1=starboard, port offsets where positive is starboard n2=forward, aft offset where positive is forward n3=height (antenna) or depth (transducer draft) offset - always positive n4=yaw rotation angle where positive for clockwise rotation n5=roll rotation angle where port side up is positive n6=pitch rotation angle where bow up is positive n7=device latency in seconds. 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.
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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.