Si-tex Explorer Nav Pro User Manual page 73

the map: they can be the landscape layout nearby a harbor, the shape of a bridge or of a
buoy etc. On some objects, such as bridges, the image associated can represent the Diagram
representing the shape of the objects and the various characteristics (length, height, type of
bridge etc.).
● Port Info
Port Info function is a combination of a Port Info database containing all the relevant Safety and
Navigational information normally found in good pilot books and presentation software which
displays special Port Facility Symbols.
● Ports & Services
Areas along shore with facilities for mooring, downloading and uploading of ships, generally
sheltered from waves and winds. Port installations are piers, wharves, pontoons, dry docks,
cranes....
● Route
Sequence of Waypoints connected by segments (Route Legs). Among the available Routes, only
one is the Active Route, which is shown by a straight line and arrows to indicate the direction.
● SCALE
Allows the display of Map Scale (magnitude of the reference scale expressed in the actual unit of
measure) and the current Map Datum.
● SNR = Signal to Noise Ratio
Ratio 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 associated to the GPS satellites signal
quality.
● SOG = Speed Over Ground
Current velocity at which the vessel is travelling, relative to a ground location. The SOG is
normally provided by the GPS sensor.
● Spot Sounding
Depth of the water in a specific and charted position. It is represented on the map by its own
value expressed in the current depth unit.
● STR = Steering
Difference between COG and CTS. If COG is 25° and CTS is 30°, then STR is 5° Right.
● STW = Speed Through Water
Speed of the vessel relative to the water.
● Tide
Periodic rise and fall of the surface of oceans, bays, etc., due principally to the gravitational
interactions between the Moon and Earth.
Chart Plotter - User Manual
73