二零二三年 优质公开课NAVTEANDEGCSERVICES.pptx

GMDSS COMMUNICATION SERVICESChapter 6 MSI AND SPECIAL SERVICESSection 2NAVTEX Services 01 Learning Objectives 02 Knowledge Points03 Summary and DiscussionCONTENTS04 Conclusion and Assignments Learning Objectives01To explain the objectives of learning this session ObjectivesTheoretical ObjectivePractical Objective Comprehensive Objective 01 Learning Objectives Knowledge Points02Composition of NAVTEX and MSI Services NAVTEX What is NAVTEX?A Navtex coordinator collates information from a national warning coordinator, a SAJR coordinator and a meteorological message coordinator in order to prepare the Navtex service. The range of Navtex is usually within 300 to 400 nautical miles of the transmitting station. 02 Knowledge Points NAVTEX Its range of workNavtex will work world-wide in any coastal waters offering a Navtex service without modification or additional tuning.Its usage The Navtex unit should be programmed to display or print only messages from stations that are of interest to the user.02 Knowledge Points Message TypesA Navigational warnings02 Knowledge PointsB Meteorological warningsC Ice reportsD Search and Rescue informationF Pilot service messagesE Meteorological forecastsG AIS messagesH LORAN messagesI OMEGA messages (now discontinued) Message TypesJ SATNAV messages02 Knowledge PointsK Other electronic navaid messagesL Navigational warnings in addition to AV Special service-trial allocationX Special services - trial allocationW Special services - trial allocationY Special services - trial allocationZ No messages on hand Special Attention02 Knowledge Points Because of their importance, messages A, B and D cannot be deselected and message L should not be deselected. alarms02 Knowledge Points An alarm will sound for priority messages.If the Navtex uses paper it will have a visible indication when it is about to run out. To reinsert a new roll, it is advisable to cut the end into a V shape as the task can be awkward. Ensure that the shiny side