By Adam Weintrit
The TransNav 2011 Symposium held on the Gdynia Maritime college, Poland in June 2011 has introduced jointly a variety of members from world wide. this system has provided various contributions, permitting to examine many features of the navigational defense from numerous diversified issues of view. themes awarded and mentioned on the Symposium have been: navigation, safeguard at sea, sea transportation, schooling of navigators and simulator-based education, sea site visitors engineering, ship's manoeuvrability, built-in structures, digital charts structures, satellite tv for pc, radio-navigation and ant. Read more...
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Extra info for International recent issues about ECDIS, e-navigation and safety at sea : marine navigation and safety of sea transportation
Therefore here only a table with the list of standard sensors with typical output data and realizations are given. TABLE 1. 1 Integrity Definition One of the key tasks of an integrated PNT Unit is the additional provision of integrity messages to the user. Within the specification of requirements for future GNSS  IMO has given the following definition of in integrity: The ability to provide users with warnings within a specified time when the system should not be used for navigation. Within that definition the alert limit specifies the applicable threshold differing between an unusable or unusable system.
The primary aim of plausibility, validity and compatibility checks is the detection of errors. The assessment of accuracy requires the implementation of suitable integrity monitoring functions. 2 Existing Integrity Monitoring approaches In this section existing integrity monitoring approaches defined for maritime navigation will be described and the seen gaps will be discussed. 1 Receiver Autonomous Integrity Monitoring (RAIM) RAIM is a technique, which can be applied in GNSS receivers to assess the integrity of navigation signals , if more than 5 GNSS signals are tracked .
2 Compatibility check for redundant GNSS systems GNSS redundancy can be achieved using a secondary GNSS device, using multiple civilian frequencies and using multiple GNSS constellations. Once the major GNSS device (antenna or receiver) is out of use, the second GNSS device can fully take the function of the major GNSS device. However, the redundant GNSS device is also affected by the errors related to the radio signal. In this sense, the significance of a redundant GNSS device is reflected during the internal failure of the major GNSS device.
International recent issues about ECDIS, e-navigation and safety at sea : marine navigation and safety of sea transportation by Adam Weintrit