Module C – Operational aspects
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1575 - Guidelines for Shipborne Position, Navigation And Timing (PNT) Data Processing – (16 June 2017) - Annex - Guidelines for Shipborne Position, Navigation and Timing (PNT) Data Processing - Module C – Operational aspects

Module C – Operational aspects

C.1 Configuration

117 The configuration of a shipborne PNT-DP is realized by the system integrator before commissioning to ensure compliance between the shipborne PNT-DP and the operational environment.

118 The intended application grade including the required accuracy and integrity level determines the minimum requirements on the data input and configuration of PNT-DP.

119 The configuration should include the specification of thresholds and value ranges used for integrity evaluation and system controlling (e.g. in relation to operational and technical accuracy levels as well as applied integrity evaluation techniques).

120 The PNT-DP is an embedded software integrated into a mothering system. The configuration of the PNT-DP is performed by manufacturer-specific tools.

C.2 Operation management

C.2.1 Automatic operation

121 The concept of the PNT-DP is based on automated processing (pre-processing, main processing, and post-processing) to adapt the functionality on current data availability and usability.

122 The PNT-DP is embedded software contributing to the Bridge Alert Management (BAM) of the mothering system by provision of status and integrity data. It does not generate alerts by itself.

123 Since the shipborne PNT-DP has a residual risk regarding total loss of all functionalities, the operational environment, e.g. the mothering system, should ensure, by a bypass, that available sensor and service data are available for applications.

C.2.2 User interaction

124 The knowledge of users regarding the usability and integrity of input devices (sensors and services) may result in the user decision to exclude data of these sensors and services from PNT data processing. However, the manual exclusion of input data is only possible on the mothering system by controlling, opening, and closing of data interfaces.

125 Due to automatic operation, there is no difference between a user exclusion of data input or a failed data input for the PNT-DP.

126 The PNT –DP should enable the graphical representation of the horizontal accuracy of position information, including status and integrity data in an integrated navigation display or workstation.

Parent topic: Annex - Guidelines for Shipborne Position, Navigation and Timing (PNT) Data Processing
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