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Lorenz WORLD MAP Pro HD Manual

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User Manual
STR = Steering
Difference between COG and CTS. If COG is 25° and CTS is 30°, then STR is 5° Right.
Target
In order to tag on the chart the point, towards which the ship is Heading, you can use a special mark, called
Target. When the Target is placed, all navigation data are referred to this Target.
TD = Time Difference
Loran positions are determined by precise timing of the intervals between reception of pulses transmitted by
pairs of stations in the selected chain. Between any two stations a ship must be located somewhere along a
line of possible positions where the measured Time Difference, TD, between arrival of pulses from those
stations would be observed. The TD is measured from the time of reception of the master station signal to
the time of reception of the slave station signal.
Tide
Periodic rise and fall of the surface of oceans, bays, etc., due principally to the gravitational interactions
between the Moon and Earth.
Tide Info
The Tide Info feature is the combination of a tide heights database that will be included within C-CARDs
and features which calculate the tide graph for all primary and secondary ports worldwide. This function can
calculate the tide heights for any past or future date and as a by-product of this calculation will also display
the Maximum and Minimum Tide height and time for the day selected plus the times of Sunrise and Sunset.
At some chart levels, the chart plotter will display a new Tide Diamond Symbol for every Port or tide point in
the database covered by that particular C-CARD.
Tide & Currents
The worldwide database with tidal stream information is available with MAX C-CARDs. When data/time is
available, Tidal stream arrows are shown on the charts, indicating the direction and strength of the Tide.
Fig. A.1a - Tides & Currents
If no data/time is available from the GPS or the chart plotter is not in Simulation mode, the icon on the map
is generic one. The color of the arrow denotes the strength of the current as follows:
0 to 0.1 kn -
0.2 to 1.0 kn -
1.1 to 2.0 kn -
2.1 to 3.0 kn -
3.1 to 9.9 kn -
Yellow
Yellow
Orange
Orange
Red
Fig. A.1b - Tides & Currents table
When the chart plotter receives a valid position fix, the Tide icons are shown on the charts on the basis of
the current date and time: the screen displays and changes arrows as date/time changes.
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