Piracy Protection - to prevent unauthorised use of data by encrypting the ENC information. Selective Access - to restrict access to ENC information to only those cells that a customer has been licenced for.
Authentication - to provide assurance that the ENC data has come from approved sources. For the mariner, this means that data which meets these standards is authenticated and comes from an official source, reducing the risk of using inaccurate data that is posed by unofficial ENCs and the risk of malware being introduced to a ship's IT systems.
Marine Traffic Management Edition 1. Under Keel Clearance Management Edition 1. This website uses cookies. To use our website you must agree with our cookie policy.
Share this page:. News archive. English English. S App1. S See Note 2. S Associated References: S Edition 6. S See Note 4. In order to perform calibrations with a high degree of accuracy, reference standards must be employed at every range or decade of the measuring or calibration instrumentation.
Clearly, this can be difficult and costly since these standards must be highly stable and their precise values must be known with a high degree of certainty and with a sufficient resolution. To minimize the cost and difficulty, more practical means of performing such calibrations is to use transfer standards.
If one has a single standard that is calibrated by a national laboratory, one can then transfer the "certified" accuracy by comparing the "certified" standard to the transfer standard for as many as three decades. The resulting accuracy of the transfer process can be much better e. This may be understood as follows: a stable, but only moderately accurate, ruler could be used to accurately transfer measurement from one object of accurately known length to a second object of unknown length.
This transfer is virtually limited only by the accuracy of the known length. This permits the progressive transfers to higher or lower decades.
0コメント