Position-fixing system displays
PT 7, Ch 9, Section 3.1.6 At least two different automatic position-fixing systems giving a continuous display of latitude and longitude are to be provided in the interests of redundancy and diversity. One of these is to be GPS or equivalent. The other is to be a system providing similar global coverage such as GLONASS, where available. When a second GPS receiver is installed to satisfy this requirement, at least one of the receivers is to be provided with differential correction functionality (DGPS) and the receivers are to be arranged to operate independently as far as is practicable.
M/S MERSol is equipped with two DGPS systems, and one GPS system.
The DGPS systems
are the primary source of position fixing and are connected to all bridge
facilities that require a DGPS input to function optimally, such as the ECDIS,
VDR, and dynamic positioning system. The GPS system is connected to the AIS
transponder. All (D)GPS systems function independently from each other and are
connected to both main and emergency power sources.