104 User Manual
Fig.A.1 - Pictures and Diagrams
OSGB = Ordnance Survey of Great Britain
A coordinate system describing only Great Britain. Generally used with GBR36 datum, which also
describes only Great Britain. This coordinate system cannot be used in any other part of the world.
Port Info
The Port Info function is a combination of a new Port Info database containing all the relevant Safety
and Navigational information normally found in good pilot books and a new 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. Among the available Routes, only one is the active
Route, which is shown by a straight line and arrows to indicate the direction.
RTCM = Radio Technical Commission for Maritime Services
The data format created by the Radio Technical Commission Maritime to transmit Differential GPS
corrections.
SOG = Speed Over Ground
A calculation of the rate of movement of the ship over the ground.
Speed
The current velocity at which you are travelling, relative to a ground location.
Spot Sounding
Depth of the water in a specific and charted position
STR = Steering
The 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 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.
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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