1. Positional accuracy: accuracy specified at 2 drms. Accuracy is quoted with respect to the given datum of the data. The quoted accuracy is the maximum value of the cumulative error in the production of the data. It should take account of survey errors, transformation errors, digitising errors, etc.
  2. full: full coverage is defined as 100% coverage usingsystematic controlled surveys providing full sea floor coverage or full coverage to a defined depth and an investigation of all contacts.
  3. systematic: systematic is defined as a controlled survey but full coverage may not have been achieved.
  4. transformed to WGS84: parameters for the transformation of various datums to or from WGS84 can befound in IHO publication S-60 (User's Handbook on Datum Transformations involving WGS-84).