Operation Manual

147
User Manual
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 Speed
Current velocity at which you are travelling, relative to a ground location.
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 Spot Sounding
Depth of the water in a specific and charted position
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 STR = Steering
Difference between COG and CTS. If COG is 25° and CTS is 30°, then STR is 5° Right.
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 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.
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 TD = Time Difference
Loran positions are determined by precise timing of the intervals between reception of pulses transmit-
ted by pairs of stations in the selected chain. Between any two stations a ship must be located some-
where 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.
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 Tide
The periodic rise and fall of the surface of oceans, bays, etc., due principally to the gravitational interac-
tions between the Moon and Earth.
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 Tide Info
The Tide Info feature is the combination of a tide heights database that will be included within new
C-CARDs and new features which calculate the tide graph for all primary and secondary ports world-
wide. 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 chartplotter 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: