Garmin 400/500 Owner's Manual

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Garmin 400/500 Owner's Manual Manual pdf 29 page image

GPSMAP 400/500 Series Owner’s Manual 23Using ChartsAIS Targeting SymbolsSymbol DescriptionAIS vessel. The vessel is reporting AIS information. Thedirection in which the triangle is pointing indicates thedirection in which the AIS vessel is moving.The target has been selected.The target has been activated. The target appearslarger on the chart. A green line attached to the targetindicates the heading of the target. The MMSI, speed, anddirection of the vessel appear beneath the target, if thedetails setting has been set to Show (page 25). If the AIStransmission from the vessel is lost, a message bannerappears.Target has been lost. A green X indicates that the AIStransmission from the vessel has been lost, and thechartplotter displays a message banner asking whether thevessel should continue to be tracked. If you discontinuevessel tracking, the lost target symbol disappears from thechart or the 3D chart view.Dangerous target in range. The target flashes while analarm sounds and a message banner appears. After thealarm has been acknowledged, a solid red triangle witha red line attached to it indicates the location and theheading of the target. If the safe-zone collision alarm hasbeen set to Off, the target flashes, but the audible alarmdoes not sound and the alarm banner does not appear. Ifthe AIS transmission from the vessel is lost, a messagebanner appears.The location of this symbol indicates the closest point ofapproach to a dangerous target, and the numbers near thesymbol indicate the time to the closest point of approach tothat target.Dangerous target has been lost. A red X indicates that theAIS transmission from the vessel has been lost, and thechartplotter displays a message banner asking whether thevessel should continue to be tracked. If you discontinuevessel tracking, the lost dangerous target symboldisappears from the chart or the 3D chart view.Heading and Projected Course of Activated AISTargetsWhen heading and course over ground information are provided byan activated AIS target, the heading of the target appears on a chartas a solid line attached to the AIS target symbol. A heading line doesnot appear on a 3D chart view.The projected course of an activated AIS target appears as a dashedline on a chart or a 3D chart view. The length of the projected courseline is based on the value of the projected heading setting(page 25). If an activated AIS target is not transmitting speedinformation, or if the vessel is not moving, a projected course linedoes not appear. Changes in the speed, course over ground, or rate ofturn information transmitted by the vessel can impact the calculationof the projected course line.