1 Ice, derelicts and other direct dangers to navigation:
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.1 The kind of ice, derelict or danger observed.
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.2 The position of the ice, derelict or danger
when last observed.
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.3 The time and date (Universal Co-ordinated Time)
when the danger was last observed.
2 Tropical cyclones (storms):footnote
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.1 A statement that a tropical cyclone has been
encountered. This obligation should be interpreted in a broad spirit,
and information transmitted whenever the master has good reason to
believe that a tropical cyclone is developing or exists in the neighbourhood.
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.2 Time, date (Universal Co-ordinated Time) and
position of ship when the observation was taken.
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.3 As much of the following information as is
practicable should be included in the message:
- barometric pressure,footnote preferably corrected
(stating millibars, millimetres, or inches, and whether corrected
or uncorrected);
- barometric tendency (the change in barometric pressure during
the past three hours);
- true wind direction;
- wind force (Beaufort scale);
- state of the sea (smooth, moderate, rough, high);
- swell (slight, moderate, heavy) and the true direction from which
it comes. Period or length of swell (short, average, long) would also
be of value;
- true course and speed of ship.