District II Quebec City-Les Escoumins - Transports Canada

7. Potentially adverse conditions.
8. Effects of ship’s speed on tidal flat ice.
• According to conventional and electronic
charts, ship’s draught, nature and
concentration of ice, weather conditions,
stage of tide, strength and set of currents
and anticipated traffic, determine preventive
action for navigating in shallow waters.
Determine best time for negotiating shallow
fairways.
• By observing ice and in consultation
with engine room, determine whether it is
necessary to warn duty engineer that sea
suction filters might become obstructed with
ice. Candidates can work in the classroom
with a tutor or independently.
• Using information received from Vessel
Traffic Services and other ships in the area,
and on the basis of weather forecasts, stage
of tide, and strength and set of current,
depth under keel at various points along
passage, and anticipated traffic, determine
adverse conditions likely to be encountered
during passage. Candidates can work in the
classroom with a tutor or independently.
• According to weather forecasts, information
about nature of ice and technical
characteristics of radar used, take into
account the possibility that readings could
be misinterpreted, which would lead to an
incorrect identification of ice conditions.
Take into account the fact that, because
of absorption and diffraction, large
concentrations of ice may not return enough
echo to the radar antenna to be detected.
Candidates can work in the classroom with
a tutor or independently.
• According to knowledge of ship, nature of
fast ice and stage of tide, take into account
effect of excessive speed when passing
close to a stretch of fast ice. Candidates
can work in the classroom with a tutor or
independently.
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