Method of displaying AIS information & SOTDMA SOTDMA to share VHF frequencySOTDMA – self organized time division multiple access.All AIS station can synchronize their time slots from highly accurate time reference.This highly accurate time reference is called SOTDMA.Per minute there are 2,250 Slots available for the transmission of AIS data.Position, course, speed, and other data … Read more
AIS static information, dynamic information, voyage related information AIS static informationStatic information remain unchangedStatic information is programmed when installing AISMMSIIMO numberCall signVessel nameVessel TypesDimensionsAntenna position AIS dynamic informationDynamic information changesPositionTimeSOGCOGHeadingROTNavigation status AIS voyage related informationTransmitted every six minutesDraftDestinationETA
AIS principle, SOLAS requirements, AIS function, advantage AIS principleConsists of one VHF transmitter, two VHF TDMA receiver, one VHF DSC receiver, display unit and sensor system.Automatic exchange of static, dynamic and voyage related data between ship to ship or ship to shore.Vessel name, call sign, position, time, speed, navigation status, safety information.GPS give position and … Read more
GPS and DGPS difference GPS and DGPS differenceBasic difference is accuracy.DGPS more accurate than GPS.GPS accuracy about 10 m.But DGPS accuracy about 1 m (even 10cm).
E Navigation and Decca navigation system Decca navigation systemWas Hyperbolic navigation systemShip and aircraft used to determine their positionHad dedicated static radio transmitterFrequency 70-129 khz E NavigationElectronic format of transmission, reception, manipulation and display of navigational information. E Navigation AdvantageReduce accident incidentReduce shipping costEnhance maritime safety securityProtect people environmentEasy and comfortable E Navigation MethodsSatellite Navigation … Read more