Chart Work 1.0
Difference between Latitude and Longitude
Lat = N/S
Long = W/E
How do you know what region a chart is referencing?
You look at it... and it will say
Ecarte and Bridge View
Port marker / buoy
What scale is distance measured on?
Latitude
With regard to chart work, when you are in doubt of something, where do you look as a reference?
Chart 1
What is the name of the launch ramp South of Boggeys (the one we have used before)?
Branton Cundick Launch Ramp / Park
i) What is/are the day colour(s) for a fairway buoy?
ii) What side do you pass it on?
i) red/white
ii) either side (leaving it to port side of vessel is preferred)
What is measured on the outer ring on the compass rose?
With regard to marine charts, what is Datum?
Essentially it is an education statement saying that at any possible time (for a reasonable number of years) this is the lowest possible depth that the water will reach
Name of the American town which is near Fawn Island (just north of Fawn Island)
Marine City
When approaching a sail boat under power in a head on situation, who has right of way?
neither, since the sail boat is under power it is treated as a power boat and thus both vessels must alter cours to starboard
You see this on the inside of the compass rose:
007o W 1999 (4'W)
What does this mean?
At the time of publication, 1999, the magnetic drift was 7 degrees W, and every subsequent year it drifts more W by 4 minutes
How far away is this position from the nearest point of mainland (on the Canadian Side) in nautical miles?
N 42o 37.375
W 082o 31.150
~0.32 NM
You are heading south down the river and approaching Ecarte Channel. i) what are the two buoys at the entrance of the channel and ii) what one is further N (more up the river)?
i) red buoy and a cardinal
ii) red further north
When heading up stream what side of the boat do we keep red navigational aids/markers?
on the starboard side
What is the location of Moore Town Launch Ramp?
N 42o50.400
W082o28.100
You make a measurement on the TRUE ring on the compass rose of 100 degrees. Convert to magnetic based on the following. The current year is 2020.
007o W 1999 (4'W)
= 7 + (21 x 4) / 60 = 1.4
7 + 1.4= 8.4o
If the magnetic drift is to the E, how do you correct the true bearing?
"West is Best and East is Least"
Determine the magnetic drift from the time of publication, then SUBTRACT it from the True
Order of Towns (from South to North) on the Canadian side of the river (starting at Ecarte Channel).
Port Lambton, Sombra, Courtwright, Moore Town, (corunna; not expected to know), Sarnia
when heading down stream u come across a buoy which is green(top) red (middle) and green (bottom). What direction is the preferred channel?
preferred channel to port (leave the buoy on your strb side)
What is at this position? Describe its light characteristics and day colours.
N42o38.375 W 082o30.400
North Cardinal Buoy
x1 white flash every second
black on top yellow on bottom