ATSC 113 Sailing Modules Exam
Questions with Correct Answers
tide - Answer-affects how the waves break because it changes where the break occurs,
is the movement of the ocean's surface up and down due to the gravitational pull of the
moon and sun
confused sea - Answer-mixed interference of several wave trains coming in different
directions and/or with different wave lengths and heights
swell refraction - Answer-As the swell hits the shallower part the rest of the wave starts
to curve such that wave becomes more parallel to the shoreline.
Swells w/ longer wave periods refract more.
swell decay - Answer-how quickly waves lose energy as they travel away from their
initial source
New Moon - Answer-A moon that is completely dark because it's unlit side is facing
Earth
full moon - Answer-moon phase when the entire side facing Earth is illuminated.
quarter moon - Answer-when the sun an moon are at right angles to each other, half of
the moon is illuminated
spring tide - Answer-when the sun and moon line up (during new and full moons) their
forces add to each other, creating higher and lower tides than usual
neap tide - Answer-during quarter moon phase, weaker tides because the sun and
moon exert opposing forces on each other
tidal range - Answer-shown on a graph plotting day and height of highest and lowest
tides
tide tables - Answer-predict the time and height of high and low tides
tidal currents - Answer-horizontal flow of water accompanying the rise and fall of the tide
flood current - Answer-incoming tide
ebb tides - Answer-outgoing tide
, slack tide/current - Answer-the moment when the tide turns and the current ceases and
reverses direction
high slack - Answer-when the tide has reached maximum height
low slack - Answer-when the tide has reached lowest height
tidal rapids - Answer-fast-flowing currents forced past narrow channels - standing
waves, black eddies, whirlpools
Environment and Climate Change Canada - Answer-ECCC - Canadian marine weather
information source
NOAA Ocean Prediction Center (OPC) - Answer-National oceanic and atmospheric
administration OPC - USA marine weather information source
Continuous Marine Broadcast - Answer-CMB
weather radio - Answer-VHF weather stations that hourly report marine weather
analysis maps - Answer-show present weather, current and recent past
forecast maps - Answer-future weather, further into the future, less accurate, informed
by analysis maps and current situations and climate of the region
Progs - Answer-prognosis map - forecast maps
barometer - Answer-instrument used to measure air pressure
Trough of Warm Air Aloft (TROWAL) - Answer-type of occluded front, Canadian symbol
looks like a check mark, associated with bad weather
average air pressure - Answer-101.3 kPa
air pressure - Answer-the weight of the air over the ground
zonal winds - Answer-latitude bands (E to W) for winds associated with lows and fronts
Meridional Winds - Answer-winds blowing north to south or south to north
Hadley Cell - Answer-a large-scale atmospheric convection cell in which air rises at the
equator and sinks at medium latitudes, typically about 30° north or south. - Coriolis
effect moves air away from the equator
Questions with Correct Answers
tide - Answer-affects how the waves break because it changes where the break occurs,
is the movement of the ocean's surface up and down due to the gravitational pull of the
moon and sun
confused sea - Answer-mixed interference of several wave trains coming in different
directions and/or with different wave lengths and heights
swell refraction - Answer-As the swell hits the shallower part the rest of the wave starts
to curve such that wave becomes more parallel to the shoreline.
Swells w/ longer wave periods refract more.
swell decay - Answer-how quickly waves lose energy as they travel away from their
initial source
New Moon - Answer-A moon that is completely dark because it's unlit side is facing
Earth
full moon - Answer-moon phase when the entire side facing Earth is illuminated.
quarter moon - Answer-when the sun an moon are at right angles to each other, half of
the moon is illuminated
spring tide - Answer-when the sun and moon line up (during new and full moons) their
forces add to each other, creating higher and lower tides than usual
neap tide - Answer-during quarter moon phase, weaker tides because the sun and
moon exert opposing forces on each other
tidal range - Answer-shown on a graph plotting day and height of highest and lowest
tides
tide tables - Answer-predict the time and height of high and low tides
tidal currents - Answer-horizontal flow of water accompanying the rise and fall of the tide
flood current - Answer-incoming tide
ebb tides - Answer-outgoing tide
, slack tide/current - Answer-the moment when the tide turns and the current ceases and
reverses direction
high slack - Answer-when the tide has reached maximum height
low slack - Answer-when the tide has reached lowest height
tidal rapids - Answer-fast-flowing currents forced past narrow channels - standing
waves, black eddies, whirlpools
Environment and Climate Change Canada - Answer-ECCC - Canadian marine weather
information source
NOAA Ocean Prediction Center (OPC) - Answer-National oceanic and atmospheric
administration OPC - USA marine weather information source
Continuous Marine Broadcast - Answer-CMB
weather radio - Answer-VHF weather stations that hourly report marine weather
analysis maps - Answer-show present weather, current and recent past
forecast maps - Answer-future weather, further into the future, less accurate, informed
by analysis maps and current situations and climate of the region
Progs - Answer-prognosis map - forecast maps
barometer - Answer-instrument used to measure air pressure
Trough of Warm Air Aloft (TROWAL) - Answer-type of occluded front, Canadian symbol
looks like a check mark, associated with bad weather
average air pressure - Answer-101.3 kPa
air pressure - Answer-the weight of the air over the ground
zonal winds - Answer-latitude bands (E to W) for winds associated with lows and fronts
Meridional Winds - Answer-winds blowing north to south or south to north
Hadley Cell - Answer-a large-scale atmospheric convection cell in which air rises at the
equator and sinks at medium latitudes, typically about 30° north or south. - Coriolis
effect moves air away from the equator
