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VDO MAP 7w Plus GPS User Manual
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Contents
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87User ManualNavigational information normally found in good pilot books and a presen-tation software which displays special Port Facility Symbols.♦ Ports & ServicesAreas along shore with facilities for mooring, downloading and uploading ofships, generally sheltered from waves and winds. Port installations are piers,wharves, pontoons, dry docks, cranes... .♦ RouteSequence of Waypoints connected by segments (Route Legs). Among the avail-able Routes, only one is the Active Route, which is shown by a straight line andarrows to indicate the direction.♦ RTCM = Radio Technical Commission for Maritime ServicesThe data format created by the Radio Technical Commission Maritime to trans-mit Differential GPS corrections.♦ ScaleMagnitude of the reference scale expressed in the actual unit of measure andthe current Map Datum.♦ SNR = Signal to Noise RatioRatio between the magnitude of a radio signal and the magnitude of the noise(that is, the interferences). The SRN is expressed in decibels and it is associ-ated to the GPS satellites signal quality.♦ SOG = Speed Over GroundCurrent velocity at which the vessel is travelling, relative to a ground location.The SOG is normally provided by the GPS sensor.♦ SPD = Speed Through WaterSpeed of the vessel relative to the water.♦ Spot SoundingsDepth of the water in a specific and charted position. It is represented on themap by its own value expressed in the current depth unit.♦ STR = SteeringDifference between COG and CTS. If COG is 25° and CTS is 30°, then STR is5° Right.♦ Total Engine HoursTotal operating hours of the machine. This value is not calculated in the plot-ter, but read from the machine.♦ TD = Time DifferenceLoran positions are determined by precise timing of the intervals betweenreception of pulses transmitted by pairs of stations in the selected chain. Be-tween any two stations a ship must be located somewhere along a line ofpossible positions where the measured Time Difference, TD, between arrivalof pulses from those stations would be observed. The TD is measured fromthe time of reception of the master station signal to the time of reception ofthe slave station signal (see also Pair).♦ TidePeriodic rise and fall of the surface of oceans, bays, etc., due principally to thegravitational interactions between the Moon and Earth.♦ Tracks & RoutesRecommended and established routes for ships at sea, including traffic sepa-ration schemes, deep water routes.♦ TRN = TurningThe difference between COG and BRG. If COG is 80° and BRG is 75°, TRN is 5°Left.♦ TTG = Time To GoEstimated time needed to reach your destination, based on your current speedand the distance to destination. |
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