Atsc sailing Objective Assessment Guide Exam Questions
and Already graded Solutions and Assured Satisfactions
2025/2026
Tide tables - correct answer a table with the tidal range for the year that
most countries publish
There are two full tide cycles per ___ - correct answer day, meaning you
have two high tides and two low tides a day
Tidal range - correct answer the difference between the highest and
lowest tide experiences in an area
Flood currents/ebb currents - correct answer when tides rise fall they
create currents; flood currents are the incoming tide and ebb currents are
the outgoing tide
Currents - correct answer horiztonal movement of water
What happens to currents when the tide turns and changes direction -
correct answer the current ceases and also changes direction
Slack tide/slack current - correct answer when the tide turns and changes
directions and the current ceases
High slack - correct answer when the tide reaches its maximum height
and pauses for a momentm and there is a moment of no current as it
switches from flooding (water coming in and tide going up) to ebbing (water
going out and tie going down)
,Currents are greater in which part of the channel and weaker where -
correct answer - mid-channel or the deepest part
- weaker over the shallower water
Low slack - correct answer when the tide reaches its lowest height and
the current comes to a brief stop before switching from ebbing to flooding;
opposite of high slack
If you find yourself travelling against the current, what can you do? -
correct answer navigate where the current isn't as strong
When wind and current are travelling together, the seas are ___ than if they
were opposing - correct answer calmer
The turn of the tide can cause a windy channel to build into - correct
answer rolling waves and whitecaps; sailors can get tricked into going into
calm waters and these waves come out of nowhere because of tide
direction change; the wind didn't change but the frictional force between the
wind and water causes waves to form
Tidal rapids - correct answer when fast flowing tidal currents are forced to
pass through narrow channels and create dangerous tidal rapids with
standing waves, large back eddies, and whirl pools
When can you safely sail through tidal rapids - correct answer during
slack currents (when the tide turns and changes directions and the current
ceases and there is a moment of no current)
,High slack and high tide occur at - correct answer the same time even
though they don't appear that way often on tide and current stations
In what situations do you care for high slack - correct answer when you
are navigating an area with high current and you want to know when the
high or low slack is so you are not travelling against the current
In what situations do you want to know if there is high tide - correct
answer when you pass shallow water (aka shoal) and you do not want to
know so you don't hit the bottom
What type of info does ECCC provide - correct answer - detailed forecast
information for the next 48 hours and a general forecast for the three days
after
- lists regions where weather earnings are in effect
- links to weather conditions and forecasts (radar, satellite, extended
forecasts, alerts, resources)
What are the main sources for marine weather info - correct answer -
Environment and Climate Chance Canada (ECCC)
- NOAA Ocean Prediction Center (OPC)
- Continuous Marine Broadcasts (CMB)
- Weather radio
Is 10 to 20 knots of wind safe to sail in - correct answer yes, for casual
sailing
What kind of info does NOAA Prediction Centre (OPC) provide? - correct
answer - info about the pacific ocean
, - weather maps
- satellite images
What kind of info does the Canadian coast guard continuous marine
broadcast (CMB) show - correct answer - weather forecast for the entire
pacific region recorded and broadcast in a continuous loop throughout the
day on various radio frequencies
- updated at 4:00, 10:30, 16:0 and 21:30
What kind of info is on weather radio - correct answer - basically a way to
access CBM via VHF weather radio
- marine communications and traffic service centre identifications
- distress and urgency info
- ice info
- notices to shipping
- weekly mean water levels
Analysis maps - correct answer weather maps for current or recent past
weather observations
Forecast maps/progs - correct answer future weather maps made by
numerical weather prediction (NWP) (progs is short for prognosis)
Why are isobars of pressure important for analysis maps/forecast maps -
correct answer close isobars indicate faster wind speeds
Trough of warm air aloft - correct answer - aka TROWAL
- a type of symbol on weather maps which is a series of check marks
and Already graded Solutions and Assured Satisfactions
2025/2026
Tide tables - correct answer a table with the tidal range for the year that
most countries publish
There are two full tide cycles per ___ - correct answer day, meaning you
have two high tides and two low tides a day
Tidal range - correct answer the difference between the highest and
lowest tide experiences in an area
Flood currents/ebb currents - correct answer when tides rise fall they
create currents; flood currents are the incoming tide and ebb currents are
the outgoing tide
Currents - correct answer horiztonal movement of water
What happens to currents when the tide turns and changes direction -
correct answer the current ceases and also changes direction
Slack tide/slack current - correct answer when the tide turns and changes
directions and the current ceases
High slack - correct answer when the tide reaches its maximum height
and pauses for a momentm and there is a moment of no current as it
switches from flooding (water coming in and tide going up) to ebbing (water
going out and tie going down)
,Currents are greater in which part of the channel and weaker where -
correct answer - mid-channel or the deepest part
- weaker over the shallower water
Low slack - correct answer when the tide reaches its lowest height and
the current comes to a brief stop before switching from ebbing to flooding;
opposite of high slack
If you find yourself travelling against the current, what can you do? -
correct answer navigate where the current isn't as strong
When wind and current are travelling together, the seas are ___ than if they
were opposing - correct answer calmer
The turn of the tide can cause a windy channel to build into - correct
answer rolling waves and whitecaps; sailors can get tricked into going into
calm waters and these waves come out of nowhere because of tide
direction change; the wind didn't change but the frictional force between the
wind and water causes waves to form
Tidal rapids - correct answer when fast flowing tidal currents are forced to
pass through narrow channels and create dangerous tidal rapids with
standing waves, large back eddies, and whirl pools
When can you safely sail through tidal rapids - correct answer during
slack currents (when the tide turns and changes directions and the current
ceases and there is a moment of no current)
,High slack and high tide occur at - correct answer the same time even
though they don't appear that way often on tide and current stations
In what situations do you care for high slack - correct answer when you
are navigating an area with high current and you want to know when the
high or low slack is so you are not travelling against the current
In what situations do you want to know if there is high tide - correct
answer when you pass shallow water (aka shoal) and you do not want to
know so you don't hit the bottom
What type of info does ECCC provide - correct answer - detailed forecast
information for the next 48 hours and a general forecast for the three days
after
- lists regions where weather earnings are in effect
- links to weather conditions and forecasts (radar, satellite, extended
forecasts, alerts, resources)
What are the main sources for marine weather info - correct answer -
Environment and Climate Chance Canada (ECCC)
- NOAA Ocean Prediction Center (OPC)
- Continuous Marine Broadcasts (CMB)
- Weather radio
Is 10 to 20 knots of wind safe to sail in - correct answer yes, for casual
sailing
What kind of info does NOAA Prediction Centre (OPC) provide? - correct
answer - info about the pacific ocean
, - weather maps
- satellite images
What kind of info does the Canadian coast guard continuous marine
broadcast (CMB) show - correct answer - weather forecast for the entire
pacific region recorded and broadcast in a continuous loop throughout the
day on various radio frequencies
- updated at 4:00, 10:30, 16:0 and 21:30
What kind of info is on weather radio - correct answer - basically a way to
access CBM via VHF weather radio
- marine communications and traffic service centre identifications
- distress and urgency info
- ice info
- notices to shipping
- weekly mean water levels
Analysis maps - correct answer weather maps for current or recent past
weather observations
Forecast maps/progs - correct answer future weather maps made by
numerical weather prediction (NWP) (progs is short for prognosis)
Why are isobars of pressure important for analysis maps/forecast maps -
correct answer close isobars indicate faster wind speeds
Trough of warm air aloft - correct answer - aka TROWAL
- a type of symbol on weather maps which is a series of check marks
