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2.2.1.6 Surface Types (A045) 18. 2.2.1.7 Datum Tie (A050) 22. ... 2.2.5.1 Chart Reference System (C310) 60. 2.2.5.2 NGVD29 to NAVD88 Conversion Factor (C010) 61 ... Approach Surveyed Flags in Fields 11-20 specify whether or not the approach surfaces was used for feature penetration analysis during the current survey, and must refer to the ... ................
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